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" (Arabic: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 either Mansub or Majrur and pronounced "Hasanan" if it is Marfu'.
- 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.