Mishkat al-Masabih #559
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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»
Anas reported God's Messenger as saying, “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.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #559 from Mishkat al-Masabih, in the Book of Prayer.