Sayyid al-Sājidīn (a) (Arabic: سیّد الساجدین), meaning "the Master of Prostrators" is among the epithets of Imam al-Sajjad (a), the fourth Imam of Shi'a. In Ilal al-sharayi', Shaykh al-Saduq mentioned the prostrations of Imam (a) as the proof and transmitted a hadith from Imam al-Baqir (a), "My father (Ali b. Husayn (a)) never mentioned a blessing, except he (a) made a prostration of gratitude and never recited a verse of the Qur'an which had a prostration but he (a) made the prostration for it. Whenever God drew away a danger or trick of a swindler from him, he (a) made a prostration and whenever he (a) finished the prayer, he (a) made a prostration; and whenever he (a) managed to reconcile between two people, he (a) made a prostration and these marks of prostration were on all the seven parts of his body used in prostration and thus he (a) was called "al-Sajjad" (the Prostrator). Al-Sayyid Ni'mat Allah al-Jaza'iri mentioned the reason for giving the epithet of "Sayyid al-Sajidin", the above-mentioned hadith. Baqir Sharif Qurashi too said that in the history of Islam, only Imam al-Sajjad (a) was titled as Sayyid al-Sajidin and Zayn al-Abidin.
- Ibn Abi al-Thalaj, Tārīkh Ahl al-Bayt, p. 131.
- Ṣadūq, ʿIlal al-sharāʾiʿ, vol. 1, p. 133.
- al-Jazāʾirī, Riyāḍ al-abrār, vol. 2, p. 13.
- Qarashī, Ḥayāt al-Imām al-Zayn al-ʿĀbidīn, vol. 1, p. 187.
- Al-Jazāʾirī, Niʿmat Allāh b. ʿAbd Allāh. Riyāḍ al-abrār. Beirut: Muʾassisah-yi al-Tārīkh al-ʿArabī, 1427 AH.
- Baghdādī, Ibn Abi al-Thalaj. Tārīkh Ahl al-Bayt. Qom: Āl-i al-Bayt, 1410 AH.
- Qarashī, Bāqir Sharīf al-. Ḥayāt al-Imām al-Zayn al-ʿĀbidīn. Beirut: Dār al-Aḍwāʾ, 1409 AH.
- Ṣadūq, Muḥammad b. ʿAlī al-. ʿIlal al-sharāʾiʿ. Najaf: Manshūrāt al-Maktaba al-Ḥaydariyya, 1385 AH.