Congregational prayer (Arabic: صلاة الجماعة) is one of the important acts of worship in Islam which should be done in group and includes both devotional and social aspects of the religion. In congregation prayer, whoever stands in the front and is followed by the people, is called "Imam" (someone who leads the prayer) and the one following him is called "Ma'mum", literally the one who is led. Some narrations imply that Islamic prayer was legislated originally as a congregational worship. The Prophet (s) and Imam 'Ali (a) performed the first congregational prayer. In addition to its ritual and moral effects, congregational prayer has many politico-social benefits like manifestation of worshiping God, manifestation and disclosure of religion in the society, cooperation for doing good deeds and preventing sins, identification of Islamic society, raising people's awareness of each other, making acquaintance and connection among Muslims by a particular discipline. Narrations have emphasized very much on participating in congregational prayers even in difficult situations and by bearing hardships. Enormous rewards have been promised for it, to the point that it is been narrated if the number of performers exceeded 10, the reward of each rak'a could not be counted. Congregational prayer is counted as the Prophet's sunna, that who leaves it with no excuse, will not gain the (merit of) true prayer.
- release of hypocrisy
- pleasure of God and the angels
- forgiveness of sins
- easing the hardships of the hereafter
- entering Heaven
- acceptance of other prayers
- receiving intercession
On the other hand, leaving congregational prayer without a valid excuse, has been considered as one of the reasons why prayer is not granted, also downgrading it has been paralleled with downgrading God.
The more people participate in congregational prayer the more they please God and the more the reward shall be. One follower will make the merit of congregational prayer 150 times more than individual prayer, and two will make it 600 times more, and if they exceeded 9, no one knows its reward except God.
In some traditions a single congregational prayer is counted as more than 40 years of individual prayer in house. In another narration the merit of praying behind an 'alim (knowledgeable person) has been equaled to the one behind the Prophet (s). The Prophet (s) said, "whoever goes toward a mosque, for every step, one thousand good deeds will be written in his record, and he will be raised one thousand levels, and if he dies in this condition, God will order 70 thousands angels to visit him in his grave, accompanying him in his loneliness, until he is resurrected from his grave."
The first congregational prayer in Islam was held by the Prophet (s) as the Imam of congregational prayer (leader of congregational prayer), and participation of Imam Ali (a), afterwards Ja'far al-Tayyar (Imam Ali's brother) joined them by the order of Abu Talib (a) (Imam Ali's father). Lady Khadija (a) was the first woman participating a congregational prayer.
Congregational prayer, recommended or obligatory?
Shi'a jurists' hold it that congregational prayer is highly recommended, but Hanbalis and some of Hanafis jurists say it is obligatory per person (wajib 'ayni) but not a condition for the validity of the prayers; and a group of Shafi'is says it is "wajib kifa'i" (obligatory for all while as long as the duty for fulfillment of a social need exists) for men who are not traveling. Most of Hanbalis and Malikis and some of Shafi'is believe that performing all wajib prayers (except for Friday Prayer) congregationally is highly recommended for all who can participate in it without bearing difficulties.
Majority of Shi'a jurists believe that prayer of Eid al-Fitr and Eid al-Adha must be performed congregationally if all the conditions (including presence of an infallible Imam) are met; however some of them allow performing it and consider it as recommended in the time of occultation. In respect of the Sunni school of thought, Hanafis and Hanbalis have the same belief, but Malikis and Shafi'is see performing the Eid prayer congregationally as recommended, however all Muslims believe that the Friday prayer is not valid if it is not performed congregationally.
Most Sunni jurists allow performing every recommended prayer congregationally, however Malikis and Hanafis believe that performing some recommended prayers (other than what is performed in the month of Ramadan) and Ayat prayer congregationally, is makruh (reprehensible). On the other hand, Shi'as jurists do not allow this at all, except for Istisqa' prayer (prayer for rain), and count every recommended prayer done congregationally, as bid'a (innovation in the religion).
How it is preformed
There is almost the same way of how to perform a congregational prayer in all Islamic sects. Imam of congregational prayer (who leads the prayer) recites Qur'an 1 (sura al-Fatiha) and a sura in the two first rak'as in behalf of the people following him in prayer, though the people behind him recite other parts quietly, while following the Imam in prayer moves and actions.
A "ma'mum" (follower in prayer) must not do the prayer acts ahead of the Imam, although it does not invalidate his prayer in the view of majority of Shi'a and some Sunni scholars. Some jurists believe that following the Imam in prayer acts is the condition of the validity of the prayer but others believe it is the condition of its recognition as a congregational prayer.
There are specific principles in both Shi'a and Sunni schools of thought, for validity of a congregational prayer, such as:
- Presence of at least two persons, one of which leads the prayer; however this ruling is a little different in friday prayer and Eid prayer.
- Similarity between the kinds of prayer Imam and ma'mum perform in respect to being recommended or obligatory (when a recommended prayer could be performed congregationally).
- Followers must not stand ahead of Imam.
- There must be no obstacle preventing followers from observing the Imam, between the first line and the Imam.
- Lines of congregational prayer must be connected to each other.
- The location of the Imam must not be higher than that of the followers; therefore, Mihrabs (a semicircular niche in the wall of a mosque) are usually built lower than the mosque's floor.
Qualifications of the Imam
- Main article: Imam of congregational prayer
Imam is the one standing in the front and leads the congregational prayer. In socio-political system of Islam, whoever leads a group of people must have certain virtues and traits, so that he inspires others. Likewise the Imam in congregational prayer should be just and have a correct recitation. 
Moreover in hadiths, some attributes are mentioned for the meritorious Imam of congregational prayer such as being superior to other people in terms of knowledge and piety, trustworthy, and be counted as adornment of the mosque.
Jurists from all the Islamic sects believe unanimously that a woman cannot lead a congregational prayer if there is a man among followers; however some Shi'a jurists allow it only if the followers are all female.
Many manners for congregational prayer have been mentioned in narrations; some of which are:
- Trying to stand in the first line (it is said that it has the reward of jihad)
- Paying attention to your own prayer and not be distracted by others' prayer or actions
- Act in accord with Imam and not mess up the order of prayer
- Wearing best clothes and perfume
- Not disturbing other people who are in lines
- Not having bad breath so that people get annoyed
- Not bothering others by reciting loudly
- Greeting with other people and asking about the ones who are absent.
- Also the Imam should care about the followers' situation.
The great emphasis on congregational prayer in Islam indicates its great impact and result on Muslims' spiritual and social life. Some of the most important impacts are: manifestation and publicizing the Islam and ikhlas (loyalty to God), showing the greatness of the religion, stoking fear in the heart of enemies and peace in believers', developing and deepening the prayer culture in the community, boosting the spirit of unity and empathy, removing the authoritarian and solitary spirit, cooperating and solving others' problems, companionship with righteous people, learning knowledge, piety, justice and principles, and etc.
Important congregational prayers
The congregational prayers that are held in Masjid al-Haram and Masjid al-Nabi are considered to be the most important congregational prayers which have been performed by Muslims from various countries and different sects over centuries. They always were platform for unity and solidarity among the Muslims.
Ayatollah Muhammad Husayn Kashif al-Ghita' represented Iraqi scholars in "Quds Islamic Congress". His personality caused him to lead the congregational prayer in Masjid al-Aqsa, in which thousands of Muslims including scholars from various Islamic sects attending the congress, participated.
This event is important because at that time Shi'a could not even perform prayer in a mosque in Beirut without taqiyya (precautionary dissimulation), but after his journey everything changed and Shi'a was treated like other Islamic sects.
- Burūjirdī, kitāb al-qibla sitr wa sātir wa makān al-muṣallī, vol. 2, p. 84.
- Qurʾān, 2:43; 3: 43.
- Nūrī, Mustadrak al-Wasāʾil, vol. 6, p. 449.
- Ṣadūq, Thawāb al-aʿmāl, p. 37.
- Ṣadūq, Thawāb al-aʿmāl, p. 37.
- Ḥurr al-ʿĀmilī, Wasāʾil al-Shīʿa, vol. 5, p. 372.
- Majlisī, Biḥār al-anwār, vol. 88, p. 4.
- Nūrī, Mustadrak al-Wasāʾil, vol. 6, p. 449.
- Ḥurr al-ʿĀmilī, Wasāʾil al-Shīʿa, vol. 5, p. 295.
- Ibn Ḥanbal, Musnad, vol. 5, p. 140.
- Majlisī, Biḥār al-anwār, vol. 85, p. 15.
- Nūrī, Mustadrak al-Wasāʾil, vol. 6, p. 446.
- Majlisī, Biḥār al-anwār, vol. 88, p. 119.
- Majlisī, Biḥār al-anwār, vol. 85, p. 434.
- Qurʾān, 3: 43.
- Majlisī, Biḥār al-anwār, vol. 85, p. 3.
- Ibn Athīr al-Jazarī, Jāmiʿ al-uṣūl, vol. 3, p. 414.
- Narāqī, Mustanad al-Shīʿa, vol. 8, p. 11-12.
- Ibn Athīr al-Jazarī, Jāmiʿ al-uṣūl, vol. 5, p. 564-566.
- Khaṭīb al-Shirbīnī, Mughnī l-Muḥtāj, vol. 1, p. 229-230.
- Narāqī, Mustanad al-Shīʿa, vol. 6, p. 6; Ṣadūq, al-Muqniʿ, p. 149.
- Mūṣilī, al-Ikhtīyār, vol. 1, p. 83.
- Jazīrī, Kitāb al-fiqh, vol. 1, p. 370.
- Ṭūsī, Kitab al-khilāf, vol. 1, p. 530.
- Jazīrī, Kitāb al-fiqh, vol. 1, p. 381-385; Khūʾī, al-Mustanad fī sharḥ al-ʿUwa al-wuthqā, vol. 17, p. 229-232.
- Yazdī, al-ʿUrwa al-wuthqā, vol. 1, p. 777-784.
- Najafī, Jawāhir al-Kalām, vol. 13, p. 275.
- Yazdī, al-ʿUrwa al-wuthqā, vol. 1, p. 798.
- Najafī, Jawāhir al-Kalām, vol. 13, p. 336-337.
- Najafī, Jawāhir al-Kalām, vol. 13, p. 337.
- Ḥurr al-ʿĀmilī, Wasāʾil al-Shīʿa, vol. 8, p. 307.
- Burūjirdī, Ḥusayn. kitāb al-qibla site wa sātir wa makān al-muṣallī. Edited by ʿAlī Panāh Ishtihārdī. Qom: Muʾassisat al-Nashr al-Islāmī, 1416 AH.
- Ḥurr al-ʿĀmilī, Muḥammad b. al-Ḥasan al-. Wasāʾil al-Shīʿa. Qom: Muʾassisat Āl al-Bayt li-Iḥyāʾ al-Turāth, 1409 AH.
- Ibn Athīr al-Jazarī, Mubārak b. Muḥammmad. Jāmiʿ al-uṣūl fī aḥādīth al-Rasūl. Edited by ʿAbd al-Qādir arnāʾūṭ. Beirut: Dār Ibn al-Athīr, 1403 AH.
- Ibn Ḥanbal, Aḥmad b. Muḥammad. Musnad Aḥmad. Beirut: Dār al-Ṣādir, [n.d].
- Jazīrī, ʿAbd al-Raḥmān al-. Kitāb al-fiqh ʿalā l-madhāhib al-arbaʿa. second edition. Beirut: Dār al-Kutub al-ʿIlmīyya, 1424 AH.
- Khaṭīb al-Shirbīnī, Muḥammad b. Aḥmad al-. Mughnī l-Muḥtāj ilā maʿrifat maʿānī l-alfāẓ al-Minhāj. Edited by Jūbilī b. Ibrahīm al-Shāfiʿī. Beirut: Dār al-Fikr, [n.d].
- Khūʾī, Sayyid Abū l-Qāsim al-. Al-Mustanad fī sharḥ al-ʿUwa al-wuthqā. Edited by Murtiḍā Burūjirdī. Qom: [n.p], 1421 AH.
- Majlisī, Muḥammad Bāqir al-. Biḥār al-anwār. Beirut: Muʾassisat al-Ṭabʿ wa l-Nashr, 1410 AH.
- Mūṣilī, ʿAbd Allāh b. Maḥmūd al-. Al-Ikhtīyār li-taʿlīl al-mukhtār. Edited by Maḥmūd Abūdaqīqa. Istanbul: [n.p], 1984.
- Najafī, Muḥammad Ḥasan al-. Jawāhir al-Kalām fī sharḥ sharāyiʿ al-Islām. Beirut: Dār Iḥyāʾ al-Turāth al-ʿArabī, 1404 AH.
- Narāqī, Aḥmad b. Muḥammad al-. Mustanad al-Shīʿa fī aḥkām al-sharīʿa. Qom: Kitābkhāna-yi Āyatollāh Marʿashī al-Najafī, 1416 AH.
- Nūrī, Mīrzā Ḥusayn al-. Mustadrak al-Wasāʾil. Qom: Muʾassisat Āl al-Bayt li-Iḥyāʾ al-Turāth, 1408 AH.
- Ṣadūq, Muḥammad b. ʿAlī al-. Al-Muqniʿ fī l-fiqh. Qom: Muʾassisat al-Imām al-Hādī, 1415 AH,
- Ṣadūq, Muḥammad b. ʿAlī al-. Thawāb al-aʿmāl. Qom: Dār al-Shrīf, 1406 AH.
- Ṭūsī, Muḥammad b. al-Ḥasan al-. Kitab al-khilāf. Daftar-i Intishārāt-i Islāmī, 1407 AH.
- Yazdī al-Ṭabāṭabāyī, Sayyid Muḥammad Kāẓim al-. Al-ʿUrwa al-wuthqā. Beirut: Muʾassisa al-Aʿlamī, 1409 AH.