سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 613
The Book of the Times (of Prayer)
Concerning One Who Forgets A Prayer
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا .
It was narrated that Anas said: The Messenger of Allah (ﷺ) said: "Whoever forgets a prayer, let him pray it when he remembers it."
Sunan an-Nasa'i, 613Sahih (Darussalam)