16:91
وَأَوۡفُوا۟ بِعَهۡدِ ٱللَّهِ إِذَا عَـٰهَدتُّمۡ وَلَا تَنقُضُوا۟ ٱلۡأَیۡمَـٰنَ بَعۡدَ تَوۡكِیدِهَا وَقَدۡ جَعَلۡتُمُ ٱللَّهَ عَلَیۡكُمۡ كَفِیلًاۚ إِنَّ ٱللَّهَ یَعۡلَمُ مَا تَفۡعَلُونَ
Fulfil the covenant of Allah when ye have covenanted, and break not your oaths after the asseveration of them, and after ye have made Allah surety over you. Lo! Allah knoweth what ye do.
— Mohammed Marmaduke William Pickthall
Wa awfoo bi Ahdil laahi izaa 'aahattum wa laa tanqudul aimaana ba'da tawkeedihaa wa qad ja'altumul laaha 'alaikum kafeelaa; innal laaha ya'lamu maa taf'aloon