Sahih al-Bukhari 2836
Sahih al-Bukhari · Book 56: Fighting for the Cause of Allah (Jihaad) · The digging of the Khandaq (trench)
Narrated Al-Bara:
حَدَّثَنَا أَبُو الْوَلِيدِ ، حَدَّثَنَا شُعْبَةُ ، عَنْ أَبِي إِسْحَاقَ، سَمِعْتُ الْبَرَاءَ ـ رضى الله عنه ـ كَانَ النَّبِيُّ صلى الله عليه وسلم يَنْقُلُ وَيَقُولُ " لَوْلاَ أَنْتَ مَا اهْتَدَيْنَا " .
The Prophet (ﷺ) went on carrying (i.e. the earth) and saying, "Without You (O Allah!) we would have got no guidance."