Surah An-Nisa, ayah 21

4:21

وَكَيۡفَ تَأۡخُذُونَهُۥ وَقَدۡ أَفۡضَىٰ بَعۡضُكُمۡ إِلَىٰ بَعۡضٖ وَأَخَذۡنَ مِنكُم مِّيثَٰقًا غَلِيظٗا ٢١

Wakayfa ta'khudhūnahū waqad afdā ba'dukum ilā ba'din wa akhadhna minkum mīthāqan ghalīzā

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