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 (PBUH) said: "Whoever forgets a prayer, let him pray it when he remembers it." Translation Not Available
Book Ref: Sunan An Nisai Book 6 Hadith 620
Web Ref: Sunan An Nisai Vol 1 Book 6 Hadith 614