4. My father and Muḥammad ibn Ḥasan both narrated to me from Ḥasan ibn Mattīl, from Ḥasan ibn ‘Ali Al-Kūfi, from ‘Ali ibn Ḥassān Al-Hāshimi, from ‘Abdil Raḥmān ibn Kuthayr – the servant of Abī Ja’far (Imam Bāqir (a.s.)), who said
Abū ‘Abdillāh (Imam Sādiq (a.s.)) said: Even if you go to Hajj every year of your life but do not go to the Ziyārah of Ḥusain ibn ‘Ali (a.s.), you have abandoned one of your obligations toward Allāh and His Messenger (s.a.a.w.). Verily Allāh has made it mandatory (on the believers to fulfill) the right(s) of Ḥusain (a.s.), and this (Ziyārah) is obligatory on every Muslim.