(50) باب الدُّعَاءِ إِذَا عَلاَ عَقَبَةً
Narrated Abu Musa:
We were in the company of the Prophet (ﷺ) on a journey, and whenever we ascended a high place, we used to say Takbir (in a loud voice). The Prophet (ﷺ) said, "O people! Be kind to yourselves, for you are not calling upon a deaf or an absent one, but You are calling an All-Hearer, and an All-Seer." Then he came to me as I was reciting silently, "La haul a wala quwwata illa bil-lah." He said, "O `Abdullah bin Qais! Say: La haul a walaquwata illa bil-lah, for it is one of the treasures of Paradise." Or he said, "Shall I tell you a word which is one of the treasures of Paradise? It is: La haul a wala quwwata illa bil-lah."
Reference: Sahih al-Bukhari 6384
In-book reference: Book 80, Hadith 79
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 75, Hadith 393