Chapter on the Rulings on Forgetfulness (Ahkam al-Sahw)
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 16
عَنْهُ عَنِ اَلْحَسَنِ بْنِ مَحْبُوبٍ عَنْ عَلِيِّ بْنِ رِئَابٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ قَالَ:« كُلُّمَا شَكَكْتَ فِيهِ بَعْدَمَا تَفْرُغُ مِنْ صَلاَتِكَ فَامْضِ وَ لاَ تَعُدْ»
From him, from al-Hasan ibn Mahbub from Ali ibn Ri'ab from Muhammad ibn Muslim:
Abu Ja‘far عليه السلام, peace be upon him, said: "Whenever you have doubt about something after you have finished your prayer, proceed and do not repeat it."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 378
- Ṣaḥīḥ al-Tahdhīb, p. 233