مُوَطَّأُ مَالِكٍ
Muwatta Malik 48
Purity
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، حَنَّطَ ابْنًا لِسَعِيدِ بْنِ زَيْدٍ وَحَمَلَهُ ثُمَّ دَخَلَ الْمَسْجِدَ فَصَلَّى وَلَمْ يَتَوَضَّأْ . قَالَ يَحْيَى وَسُئِلَ مَالِكٌ هَلْ فِي الْقَىْءِ وُضُوءٌ قَالَ لاَ وَلَكِنْ لِيَتَمَضْمَضْ مِنْ ذَلِكَ وَلْيَغْسِلْ فَاهُ وَلَيْسَ عَلَيْهِ وُضُوءٌ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar prepared the body of one of Said ibn Zayd's sons for burial and carried it and then entered the mosque and prayed without doing wudu. Yahya said that Malik was asked whether it was necessary to do wudu because of regurgitating undigested food and he said, "No, wudu is not necessary, but the mouth should be rinsed."
Arabic/English book reference: Book 2, Hadith 18