وَأَوْفُواْ بِعَهْدِ اللّهِ إِذَا عَاهَدتُّمْ وَلاَ تَنقُضُواْ الأَيْمَانَ بَعْدَ تَوْكِيدِهَا وَقَدْ جَعَلْتُمُ اللّهَ عَلَيْكُمْ كَفِيلاً إِنَّ اللّهَ يَعْلَمُ مَا تَفْعَلُونَ
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سورة النحل
(16/91) And fulfil the covenant of Allahs when ye have covenanted, and violate not the oaths after the ratification thereof, and surely ye have appointed Allah a surety over you. verily Allah knoweth that which ye do:
Surah An-Nahl