Surah An-Nisa — Ayah 21 (4:21)
وَكَيۡفَ تَأۡخُذُونَهُۥ وَقَدۡ أَفۡضَىٰ بَعۡضُكُمۡ إِلَىٰ بَعۡضٖ وَأَخَذۡنَ مِنكُم مِّيثَٰقًا غَلِيظٗا ٢١
English translation (Saheeh International)
And how could you take it while you have gone in unto each other and they have taken from you a solemn covenant?
Brief commentary
How could you take what you gave to them as a dowry after the relationship, love, enjoyment and sharing of secrets that has occurred between you? Greed for the wealth which is theirs after all this is forbidden and shameful. They took a sincere promise from you, by which they became lawful to you through the Word of Allah and His sacred law.