Hadith 1099
أشهد أن لا اله الا الله الرحمن الرحيم ، اللهم أذهب عنى الهم والحزن
"In one narration, it is mentioned that after finishing the prayer, the Messenger of Allah (peace and blessings be upon him) would wipe his right hand over his forehead and say: «أشهد أن لا اله الا الله الرحمن الرحيم ، اللهم أذهب عنى الهم والحزن»."