Sahih Bukhari

Narrated Abu Musa Al-Ash`ari:The Prophet (ﷺ) started ascending a high place or hill. A man (amongst his companions) ascended it and shouted in a loud voice, ""La ilaha illal-lahu wallahu Akbar."" (At that time) Allah's Messenger (ﷺ) was riding his mule. Allah's Messenger (ﷺ) said, ""You are not calling upon a deaf or an absent one."" and added, ""O Abu Musa (or, O `Abdullah)! Shall I tell you a sentence from the treasure of Paradise?"" I said, ""Yes."" He said, ""La haul a wala quwwata illa billah