Musnad Ahmad 27:122

Sufyan ibn 'Uyaynah narrated to us, Salih ibn Kaysan narrated to us, from Salim, from his father: When the Prophet, peace and blessings of Allah be upon him, would return from Hajj, 'Umrah, or a military expedition, and he would ascend a high ground of the earth, he would say: "There is no god but Allah alone, He has no partner. To Him belongs the dominion, and to Him belongs the praise, and He is capable of all things. Allah fulfilled His promise, aided His servant, and defeated the confederates alone. We are returning, if Allah wills, repenting, worshipping, and praising our Lord."