Musannaf Ibn Abi Shayba 21:655

Waki’ narrated to us, from Sufyan, from ‘Asim ibn ‘Ubayd Allah, from ‘Abd Allah ibn al-Harith, from his father, that the Prophet (peace and blessings of Allah be upon him) used to say the like of what the caller to prayer (mu’adhdhin) says. So when he said, "Hayya ‘ala al-salah" (Come to prayer) and "Hayya ‘ala al-falah" (Come to success), he would say, "La hawla wa la quwwata illa billah" (There is no power and no strength except by Allah).