Nafi' (may Allah have mercy on him) said: We used to wash the deceased; some of our companions would perform ablution and some would take a ritual bath. Then we would come back and shroud him, then apply perfume (hanut) to him and offer his funeral prayer, and we would not repeat the ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1467