Narrated Ibn 'Umar:
That a man came to him (while two groups of Muslims were fighting) and said, "O Abu 'Abdur Rahman! Don't you hear what Allah has mentioned in His Book:
'And if two groups of believers fight...
Allah is sufficient for me. There is none worthy of worship but Him. I have placed my trust in Him, He is Lord of the Majestic Throne. (Recite seven times in Arabic).
Info: Allah will grant whoever recites this seven times in the morning or evening whatever he desires from this world or the next, Ibn As-Sunni (no. 71), Abu Dawud 4/321. Both reports are attributed directly to the Prophet j§ (Marfu1). The chain of transmission is sound (Sahih). Ibn As-Sunni.