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 ibnal-Khattab said, "If you fall asleep Iying down you must do wudu (before you pray) . " Translation Not Available
Book Ref: Muwatta Imam Malik Book 2 Hadith 39
Web Ref: Muwatta Imam Malik Book 2 Hadith 10