Musnad Ahmad 284:24

Isma'il narrated to us, Hajjaj ibn Abi 'Uthman narrated to us, Abu al-Zubayr narrated to us, he said: I heard 'Abdullah ibn al-Zubayr speaking upon this pulpit, and he was saying: When the Messenger of Allah (peace and blessings of Allah be upon him) would say the taslim at the end of the prayer—or the prayers—he would say: "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. There is no power and no strength except by Allah. We worship none but Him. He is the possessor of grace, bounty, and good praise. There is no god but Allah, [we are] sincere to Him in religion, even if the disbelievers hate it."