Sayyiduna Abu Sallam (may Allah be pleased with him), who was the servant of the Messenger of Allah (peace and blessings be upon him), narrates from the Messenger of Allah (peace and blessings be upon him) that he (peace and blessings be upon him) said: "There is no servant, or human being, or Muslim who says in the evening and in the morning: 'Raditu billahi rabban wa bil-Islami dinan wa bi-Muhammadin nabiyyan' (I am pleased with Allah as Lord, with Islam as religion and with Muhammad (peace and blessings be upon him) as Prophet), except that it becomes a right upon Allah to please him on the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19124