Musannaf Ibn Abi Shayba 21:189

Yazid ibn Harun narrated to us, Hammad ibn Salamah informed us, from Asim, from Siwa, from Hafsa: That the Messenger of Allah, may Allah bless him and grant him peace, when he would take to his bed, he would say: "O my Lord, protect me from Your punishment on the day You resurrect Your servants."