Muwatta Malik #39
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ إِذَا نَامَ أَحَدُكُمْ مُضْطَجِعًا فَلْيَتَوَضَّأْ .
Yahya related to me from Malik from Zayd ibn Aslam that Umar ibn
al-Khattab said, "If you fall asleep Iying down you must do wudu (
before you pray) . "
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About Muwatta Malik
This hadith is #39 from Muwatta Malik, in the Book of Purity.