On refraining from mentioning anything disliked in the corpse

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

154. Chapter: On refraining from mentioning anything disliked in the corpse

928. Abu Rafi' Aslam, the client of the Messenger of Allah, reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Anyone who washes a dead person and keeps quiet about him, Allah will forgive him forty times." [al-Hakim]