Sunan Ibn Majah, Chapter: Chapters Regarding Funerals

"When Abdullah bin Ubayy died, his son came to The Prophet (saw) and said: 'O Messenger of Allah, give me your shirt so that I may shroud him in it.' The Messenger of Allah (saw) said: 'Notify me when he is ready (i.e., when he has been washed and shrouded).' When The Prophet (saw) wanted to offer the funeral prayer for him: 'You should not do that.' The Prophet (aw) offered the funeral prayer for him, and The Prophet (saw) said to him: 'I have been given two choices: "...ask forgiveness for them (hypocrites) or ask not forgiveness for them...'" [9:80] Then Allah revealed: 'And never pray (the funeral prayer) for any of them (hypocrites) who dies, nor stand at his grave.'" [9:84] Sahih