The Holy Quran 8:63 — Surah Al-Anfal
Arabic text
وَأَلَّفَ بَيْنَ قُلُوبِهِمْ ۚ لَوْ أَنفَقْتَ مَا فِى ٱلْأَرْضِ جَمِيعًا مَّآ أَلَّفْتَ بَيْنَ قُلُوبِهِمْ وَلَـٰكِنَّ ٱللَّهَ أَلَّفَ بَيْنَهُمْ ۚ إِنَّهُۥ عَزِيزٌ حَكِيمٌ
Translation
...and created the bond of love (harmony) between their hearts. If you had spent whatever (wealth and resources) is in the earth, you will not have been able to create that bond of love between their hearts, but Allaah created that bond between them. Verily He is Mighty (can do whatever He wants), the Wise (in creating the bond of love between people).
Tafsir (excerpt) — Tafsir Usmani
Unity and mutual affection among the Arabs: before Islam, quarrelling and fighting, discord and dissension were rife among the Arabs. Over the most trivial things the tribes kept clashing with one another; when fighting broke out between two groups, its fire would not cool down for centuries.
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