General Behavior (Kitab Al-Adab)
Dawud :: Book 41 : Hadith 5061
Narrated Muslim at-Tamimi:
The Apostle of Allah (peace_be_upon_him) 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 Apostle of Allah (peace_be_upon_him) said this to us secretly, so we confine it to our brethren.