Concerning the athan (the call to prayer)

There is no might and no power except by Allah.

Reference:Al-Bukhari 1/152, Muslim 1/288.Hisnul Muslim 22

لا حول ولا قوة إلا بالله.

Transliteration

Lā ḥawla wa lā quwwata 'illā billāh.

Translation

There is no might and no power except by Allah.