Chapter on the Rulings on Forgetfulness (Ahkam al-Sahw)
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 16
عَنْهُ عَنْ فَضَالَةَ عَمَّنْ رَوَاهُ عَنْ أَبِي بَصِيرٍ قَالَ قَالَ أَبُو عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ:« يُرْفَعُ لِلرَّجُلِ مِنَ اَلصَّلاَةِ رُبُعُهَا أَوْ ثُمُنُهَا أَوْ نِصْفُهَا أَوْ أَكْثَرُ بِقَدْرِ مَا سَهَا وَ لَكِنَّ اَللَّهَ تَعَالَى يُتِمُّ ذَلِكَ بِالنَّوَافِلِ»
From him, from Faddalah from someone who narrated it from Abu Basir, who said:
Abu Abdillah عليه السلام, peace be upon him said: "A man’s prayer may be raised up for him as a fourth of it, or an eighth of it, or a half of it, or more, according to how much he was heedless. But Allah سبحانه وتعالى, the Exalted, completes that through the supererogatory prayers."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 367
- Ṣaḥīḥ al-Tahdhīb