Musannaf Ibn Abi Shayba 21:140

Abu Mu'awiyah narrated to us, from al-A'mash, from al-Musayyab ibn Rafi', from Warrad, the freed slave of al-Mughirah, who said: Mu'awiyah wrote to al-Mughirah ibn Shu'bah: "What did the Messenger of Allah, may Allah bless him and grant him peace, use to say when he finished the prayer?" He said: So he dictated it to me. Al-Mughirah said: So I wrote it to Mu'awiyah: "The Messenger of Allah, may Allah bless him and grant him peace, used to say when he finished [the prayer]: 'There is no god but Allah, alone, with no partner. To Him belongs the dominion, and to Him belongs the praise, and He is capable of all things. O Allah, there is no preventer of what You have given, and no giver of what You have prevented, and the wealth of the wealthy does not benefit them against You.'"