مُوَطَّأُ مَالِكٍ
Muwatta Malik 110
Purity
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا أَرَادَ أَنْ يَنَامَ، أَوْ يَطْعَمَ وَهُوَ جُنُبٌ غَسَلَ وَجْهَهُ وَيَدَيْهِ إِلَى الْمِرْفَقَيْنِ وَمَسَحَ بِرَأْسِهِ ثُمَّ طَعِمَ أَوْ نَامَ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar, if he wished to sleep or eat while junub, would wash his face, and his arms to the elbows, and wipe his head. Then he would eat or sleep. 2:20 The Repetition of the Prayer by a Person in a State of Major Ritual Impurity, his Doing Ghusl, when He has Prayed without Remembering it, and his Washing his Garments.
Arabic/English book reference: Book 2, Hadith 80