Sahih Bukhari | Volume 1 | Hadith Number 587

Narrated by Yahya as above (586) and added
Some of my companions told me that Hisham had said, "When the Mu'adhdhin said, "Haiya alas-sala(t) (come for the prayer)." Muawiya said, "La hawla wala quwata illa billah (There is neither might nor any power except with Allah)" and added, "We heard your Prophet saying the same."