38:79Saad

The Messenger of Allah (ﷺ) used to lay his head upon his right hand when going to sleep, then say: “My Lord, safeguard me from Your punishment the Day You resurrect Your slaves (Rabbi qinī `adhābaka yawma tab`athu `ibādak).”

"The Messenger of Allah said: 'Whoever says when he hears the call to the prayer: "Allahumma Rabba hadhihid-da'watit-tammah was-salatil-qa'imah, ati Muhammadanil-wasilata wal-fadilah, wab'athhu maqaman mahmudanilladhi wa'adtah (O Allah, Lord of this perfect call and the prayer to be offered, grant Muhammad the privilege (of intercession) and also the eminence, and resurrect him to the praised position that You have promised)," my intercession for him will be permitted on the Day of Resurrection.'"

I said: Messenger of Allah, the son of Jud'an established ties of relationship, fed the poor. Would that be of any avail to him? He said: It would be of no avail to him as he did not ever say: O my Lord, pardon my sins on the Day of Resurrection.

When the Prophet (ﷺ) would sleep, he would put his hand under his head then say: “O Allah, safeguard me from Your Punishment the Day You gather )” or “you resurrect your slaves (tab`athu `ibādak).”

that the Prophet (ﷺ) said, "For every prophet there is an invocation that surely will be responded by Allah," (or said), "For every prophet there was an invocation with which he appealed to Allah, and his invocation was accepted (in his lifetime), but I kept my (this special) invocation to intercede for my followers on the Day of Resurrection."