An-Nahl - 16:91

وَأَوْفُواْ بِعَهْدِ اللّهِ إِذَا عَاهَدتُّمْ وَلاَ تَنقُضُواْ الأَيْمَانَ بَعْدَ تَوْكِيدِهَا وَقَدْ جَعَلْتُمُ اللّهَ عَلَيْكُمْ كَفِيلاً إِنَّ اللّهَ يَعْلَمُ مَا تَفْعَلُونَ
[16:91]
And fulfill the covenant of Allah when you have made a covenant, and do not break the oaths after making them fast, and you have indeed made Allah a surety for you; surely Allah I . knows what you do.
Fulfil the Covenant of Allah when ye have entered into it, and break not your oaths after ye have confirmed them; indeed ye have made Allah your surety; for Allah knoweth all that ye do.
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.