Al-Anfal 8:63

وَأَلَّفَ بَيۡنَ قُلُوبِهِمۡۚ لَوۡ أَنفَقۡتَ مَا فِي ٱلۡأَرۡضِ جَمِيعٗا مَّآ أَلَّفۡتَ بَيۡنَ قُلُوبِهِمۡ وَلَٰكِنَّ ٱللَّهَ أَلَّفَ بَيۡنَهُمۡۚ إِنَّهُۥ عَزِيزٌ حَكِيمٞ 63

And brought together their hearts. If you had spent all that is in the earth, you could not have brought their hearts together; but Allah brought them together. Indeed, He is Exalted in Might and Wise