Sahih al-Bukhari, Hadith 6610 ⓘ
Narrated Abu Musa: While we were with Allah's Messenger in a holy battle, we never went up a hill or reached its peak or went down a valley but raised our voices with Takbir. Allah's Messenger came close to us and said, "O people! Don't exert yourselves, for you do not call a deaf or an absent one, but you call the All- Listener, the All-Seer." The Prophet then said, "O `Abdullah bin Qais! Shall I teach you a sentence which is from the treasures of Paradise? ( It is): 'La haula wala quwata illa billah. (There is neither might nor power except with Allah).
حَدَّثَنِي مُحَمَّدُ بْنُ مُقَاتِلٍ أَبُو الْحَسَنِ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا خَالِدٌ الْحَذَّاءُ، عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ، عَنْ أَبِي مُوسَى، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي غَزَاةٍ فَجَعَلْنَا لاَ نَصْعَدُ شَرَفًا، وَلاَ نَعْلُو شَرَفًا، وَلاَ نَهْبِطُ فِي وَادٍ، إِلاَّ رَفَعْنَا أَصْوَاتَنَا بِالتَّكْبِيرِ ـ قَالَ ـ فَدَنَا مِنَّا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " يَا أَيُّهَا النَّاسُ ارْبَعُوا عَلَى أَنْفُسِكُمْ فَإِنَّكُمْ لاَ تَدْعُونَ أَصَمَّ وَلاَ غَائِبًا إِنَّمَا تَدْعُونَ سَمِيعًا بَصِيرًا ". ثُمَّ قَالَ " يَا عَبْدَ اللَّهِ بْنَ قَيْسٍ، أَلاَ أُعَلِّمُكَ كَلِمَةً هِيَ مِنْ كُنُوزِ الْجَنَّةِ، لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ ".
also referenced under: Book 82, Hadith 16 (In-Book) & Volume 8, Book 77, Hadith 607 (USC-MSA)