وَعَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ نَسِيَ صَلَاةً أَوْ نَامَ عَنْهَا فَكَفَّارَتُهُ أَنْ يُصَلِّيَهَا إِذَا ذَكَرَهَا». وَفِي رِوَايَةٍ: «لَا كَفَّارَة لَهَا إِلَّا ذَلِك»
The Messenger of Allah (sallallahu alayhi wa sallam) said:, “If anyone forgets a stated prayer or oversleeps, expiation is made by observing it when he remembers it.” A version has “That is the only expiation for it.”
Mishkat al-Masabih 560, Book 5, Prayer, Hadith 38. 1 min read