Warrad said: Sayyiduna al-Mughirah (may Allah be pleased with him) wrote to Mu'awiyah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to say after the prayer: "There is no true god except Allah, He is alone, He has no partner; His is the dominion and to Him belongs all praise, and He has power over all things. O Allah, none can withhold what You give, and none can give what You withhold, and the greatness of one who has greatness avails him nothing against You."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18037