Ibrahim narrates that Sayyiduna Abdullah (may Allah be pleased with him) was asked whether the one who washes the deceased should (himself) take a ritual bath (ghusl). He said: "If you consider your (Muslim) companion to be impure, then take a bath because of (touching) him; otherwise, ablution (wudu) alone is sufficient for you."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9568