Al-Anfal (The Spoils of War)

Surah 8 · Verse 63

and He put unity in their hearts. Had you spent all that is in the earth (even then) you would not have been able to put unity in their hearts, but Allah has put unity among them. He is certainly Mighty, Wise.

وَأَلَّفَ بَيْنَ قُلُوبِهِمْ ۚ لَوْ أَنْفَقْتَ مَا فِي الْأَرْضِ جَمِيعًا مَا أَلَّفْتَ بَيْنَ قُلُوبِهِمْ وَلَٰكِنَّ اللَّهَ أَلَّفَ بَيْنَهُمْ ۚ إِنَّهُ عَزِيزٌ حَكِيمٌ