Musnad Ahmad 1111:12

Aswad ibn Amir and Husayn ibn Muhammad narrated to us, they said: Sharik narrated to us, from Asim ibn Ubayd Allah, from Ali ibn al-Husayn, from Abu Rafi, from the Prophet, peace and blessings of Allah be upon him, who said: He used to, when he heard the caller to prayer, say the like of what he said, until when he reached "Hayya 'ala al-salah" (come to prayer) and "Hayya 'ala al-falah" (come to success), He said: "La hawla wa la quwwata illa billah" (There is no power and no strength except by Allah).