16:91
وَ أَوْفُ وا۟ بِ عَهْدِ ٱللَّهِ إِذَا عَٰهَد تُّمْ وَ لَا تَنقُضُ وا۟ ٱلْ أَيْمَٰنَ بَعْدَ تَوْكِيدِ هَا وَ قَدْ جَعَلْ تُمُ ٱللَّهَ عَلَيْ كُمْ كَفِيلًا إِنَّ ٱللَّهَ يَعْلَمُ مَا تَفْعَلُ ونَ
And fulfill the covenant of Allah when you have taken it, [O believers], and do not break oaths after their confirmation while you have made Allah, over you, a witness. Indeed, Allah knows what you do.