وَكَيْفَ تَأْخُذُونَهُ وَقَدْ أَفْضَى بَعْضُكُمْ إِلَى بَعْضٍ وَأَخَذْنَ مِنكُم مِّيثَاقًا غَلِيظًا
How could you take it back, when you have known each other, and they have taken from you a solemn covenant?
Agha Ali Puya Commentary
Commentary on Quran 4:21
[Pooya/Ali Commentary 4:21] (see commentary for verse 20)