Hadithcore
Sahih al-Bukhari, 6610
sahih

Narrated Abu Musa:

While we were with Allah's Messenger (ﷺ) 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 (ﷺ) 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 (ﷺ) 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 ‏"‏‏.‏

References2 variants
In-Book Reference
Book 82, Hadith 16
USC-MSA web (English) reference
Vol. 8, Book 77, Hadith 607 (deprecated numbering scheme)
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