Warrad, the scribe of Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him), relates that Mu'awiyah (may Allah be pleased with him) wrote to al-Mughirah bin Shu'bah (may Allah be pleased with him): Write to me something that you heard from the Messenger of Allah (peace and blessings be upon him). So he wrote to him: When he (peace and blessings be upon him) had prayed and finished, he would say: "There is no true god except Allah, He is alone, He has no partner - Ibn Awn said: I think he also said next: - 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 / 18058