Musnad Ahmad 33:958

Sufyan ibn 'Uyaynah narrated to us, from 'Amr ibn Dinar, who heard it from Jabir ibn 'Abdullah: "The Prophet, peace and blessings of Allah be upon him, came to 'Abdullah ibn Ubayy after he had been placed in his grave. He placed him on his knee, clothed him in his shirt, and blew upon him from his saliva."