Sunan Abi Dawud 5079

Al-Harith b. Muslim al-Tamimi quoted his father Muslim b. al-Harith al-Tamimi as saying that the Messenger of Allah (ﷺ) told him secretly:When you finish the sunset prayer, say: 'O Allah, protect me from Hell" seven times; for if you say that and die that night, protection from it would be recorded for you; and when you finish the dawn prayer, say it in a similar way, for if you die that day, protection from it would be recorded for you. AbuSa'id told me that al-Harith said: The Messenger of Allah (ﷺ) said this to us secretly, so we confine it to our brethren