Mishkat al-Masabih #1211
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «من نَام عَن الْوِتْرِ أَوْ نَسِيَهُ فَلْيُصَلِّ إِذَا ذَكَرَ أَوْ إِذا اسْتَيْقَظَ» . رَوَاهُ التِّرْمِذِيّ
أَبُو دَاوُد وَابْن مَاجَه
Abu Sa'id reported God’s Messenger as saying, “If anyone over-sleeps and misses the witr, or forgets it, he should pray when he remembers and when he awakes.”
Tirmidhi, Abu Dawud and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #1211 from Mishkat al-Masabih, in the Book of Prayer.