Al-Kāfi - The Book of Haj

Chapter: Performing Salat (prayer) in Complete Form in the Two Sacred Places ِنْ أَصْحَابِنَا عَنْ أَحْ٠َانَ بْنِ عِيسَى قَالَ سَأَلْتُ أَبَا الْحَسَنِ (عَلَيْهِ السَّلاَ٠ِ الصَّلاةِ وَالصِّيَا٠َيْنِ فَقَالَ أَتِ٠َّهَا وَلَوْ صَلاةً وَاحِدَةً. 2.

A number of our people have narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa who has said the following: “I once asked abu al-Hassan (a.s.), about performing Salat (prayer) in complete form and fasting in the two al-Haram (the sacred places); Masjid al-Haram and Masjid of al-Madinah.

He (the Imam) said, ‘You should perform Salat (prayer) in complete form, even if it is one Salat (prayer).”’ وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (18/220))