Al-Harith bin Muslim al-Tamimi quoted his father Muslim bin 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. Abu Saeed told me that al-Harith said: The Messenger of Allah ﷺ said this to us secretly, so we confine it to our brethren.
Hadith Referenceسنن ابي داود / أبواب النوم / 5079
Hadith Gradingالألبانی:ضعيف | زبیر علی زئی:حسن, مشكوة المصابيح (الحارث بن مسلم: حسن الحديث علي الراجح)
Hadith Takhrij« تفرد بہ أبو داود، (تحفة الأشراف: 3281) (ضعیف) » (الحارث بن مسلم (صحابی کے لڑکے) مجہول ہیں)
3: After the (obligatory) morning and evening prayers, recite the following supplication seven times: «اَللّٰهُمَّاَجِرْنِيْمِنَالنَّارِ» O my Allah! Keep me in Your protection from the Fire. [ابوداود: 5079 و سنده حسن وصححه ابن حبان، الموارد: 2346]
Note: The narrator of this hadith, Harith bin Muslim, has been declared trustworthy (thiqah) by Ibn Hibban, and some scholars have mentioned him among the Companions (Sahabah). The hadith of such a narrator does not fall below the level of hasan (good). Also see: [التلخيص الحبير ج1 ص 47 ح 70 جدة رباح] Hafiz Ibn Hajar has called this narration “hasan.” [نتائج الافكار ج 2 ص 326 مجلس: 191] Munziri has indicated towards its being hasan. [الترغيب و الترهيب 303/1، 304] And Haythami has declared Harith bin Muslim trustworthy (thiqah). [مجمع الزوائد 99/8]
Source: Sahih Ibn Khuzaymah: Commentary by Muhammad Farooq Rafee, Page: 49