Burayda bin al-Husayb · The Book on Jana''iz (Funerals)

"I heard Abdullah saying: 'I heard the Messenger of Allah saying: "The believer's soul seeps out, and I do not like the death like that of a donkey." They said: "And what is the death of a donkey?" He said: "A sudden death."]

"The Messenger of Allah prohibited plastering graves, writing on them, building over them, and treading on them."