Very weak or denounced — not to be relied upon or attributed to the Prophet ﷺ with certainty.
It was narrated from ‘Ali that the Messenger of Allah (ﷺ) said:“Whoever washes a deceased person, shrouds him, embalms him, carries him and offers the funeral prayer for him, and does not disclose what he has seen, he will emerge from his sins as on the day his mother bore him.”