In some hadiths, Imam al-Hasan al-Mujtaba (a) and Imam al-Husayn (a) are referred to as "Hasanayn (a)". In the al-Shiqshiqiyya Sermon, the phrase "until Hasanayn were squashed under the feet" (حتی لقد وطئ الحسنان) has sometimes been explained as Imam al-Hasan al-Mujtaba (a) and Imam al-Husayn (a) and sometimes as two toes.
Regarding Arabic grammar, this word is pronounced "Hasanayn" when it is in the position of object and pronounced "Hasanan" if it is in the position of subject.
- Mufīd, al-Irshād, vol. 1, p. 289.
- Ibn Shahr Āshūb, Manqāb Āl Abī Ṭālib, vol. 3, p. 398.
- Mufīd, Muḥammad b. Muḥammad al-. Al-Irshād fī maʿrifat ḥujaj Allāh ʿala l-ʿibād. Qom: Muʾassisat Āl al-Bayt, 1413 AH.
- Ibn Shahr Āshūb, Muḥammad b. ʿAlī. Manqāb Āl Abī Ṭālib. Qom: ʿAllāma, 1379 Sh.