النحل — An-Nahl Ayat 91
وَاَوْفُوْا بِعَهْدِ اللّٰهِ اِذَا عَاهَدْتُّمْ وَلَا تَنْقُضُوا الْاَيْمَانَ بَعْدَ تَوْكِيْدِهَا وَقَدْ جَعَلْتُمُ اللّٰهَ عَلَيْكُمْ كَفِيْلًا ۗاِنَّ اللّٰهَ يَعْلَمُ مَا تَفْعَلُوْنَ
Wa aufū bi‘ahdillāhi iżā ‘āhattum wa lā tanquḍul-aimāna ba‘da taukīdihā wa qad ja‘altumullāha ‘alaikum kafīlā(n), innallāha ya‘lamu mā taf‘alūn(a).
"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."