Surah An-Nisa, Verse 21

وَكَيۡفَ تَأۡخُذُونَهُۥ وَقَدۡ أَفۡضَىٰ بَعۡضُكُمۡ إِلَىٰ بَعۡضٖ وَأَخَذۡنَ مِنكُم مِّيثَٰقًا غَلِيظٗا٢١

wakayfa takhudhūnahu waqad afḍā baʿḍukum ilā baʿḍin wa-akhadhna minkum mīthāqan ghalīẓan

And how could you take it while you have gone in unto each other and they have taken from you a solemn covenant?