The Book of the Prayer
2/10. Chapter:
Whoever Sleeps Through Prayer Or Forgets it
Sunan Ibn Majah
حَدَّثَنَا جُبَارَةُ بْنُ الْمُغَلِّسِ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا " .
It was narrated that Anas bin Malik said: "The Messenger of Allah said: 'Whoever forgets a prayer, let him perform it when he remembers it.'"
Reference : Sunan Ibn Majah 696In-book reference : Book 2, Hadith 30English translation : Vol. 1, Book 2, Hadith 696