Sunan Ibn Majah, Chapter: The Chapters on Etiquette

the Prophet(saw) said: "Whoever says, following the morning prayer: La ilaha illallahu wahdahu la sharikalahu, lahul mulku wa lahul hamdu, bi yadihil khair, wa huwa ala kulli shayin qadir (None has the right to be worshipped but Allah alone, with no partner or associate. His is the dominion, all praise is to Him, in His Hand is all goodness, and He is Able to do all things), it will be as if he freed slave from among the sons of Ismail."