It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that the Prophet (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; He is Ever-Living and will never die; in His hand is all good, 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 / 18050