Musannaf Ibn Abi Shayba 17:1228

Al-Fadl ibn Dukayn narrated to us, he said: Zuhayr narrated to us, from Abu Ishaq, from ‘Asim, from ‘Ali, who said: "When you take to your bed, say: 'In the name of Allah, and in the way of Allah, upon the religion of the Messenger of Allah.' And when you place the deceased into his grave."