AN NAHL — Ayat 91
وَأَوْفُواْ بِعَهْدِ اللّهِ إِذَا عَاهَدتُّمْ وَلاَ تَنقُضُواْ الأَيْمَانَ بَعْدَ تَوْكِيدِهَا وَقَدْ جَعَلْتُمُ اللّهَ عَلَيْكُمْ كَفِيلاً إِنَّ اللّهَ يَعْلَمُ مَا تَفْعَلُونَ
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.
Tafsir Ibnu Katsir
وَأَوْفُواْ بِعَهْدِ اللَّهِ إِذَا عَـهَدتُّمْ وَلاَ تَنقُضُواْ الاٌّيْمَـنَ بَعْدَ تَوْكِيدِهَا وَقَدْ جَعَلْتُمُ اللَّهَ عَلَيْكُمْ كَفِيلاً إِنَّ اللَّهَ يَعْلَمُ مَا تَفْعَلُونَ - وَلاَ تَكُونُواْ كَالَّتِى نَقَضَتْ غَزْلَهَا مِن بَعْدِ قُوَّةٍ أَنكَـثًا تَتَّخِذُونَ أَيْمَـنَكُمْ دَخَلاً بَيْنَكُمْ أَن تَكُونَ أُمَّةٌ هِىَ أَرْبَى مِنْ أُمَّةٍ إِنَّمَا يَبْلُوكُمُ اللَّهُ بِهِ وَلَيُبَيِّنَنَّ لَكُمْ يَوْمَ الْقِيَـمَةِ مَا كُنْتُمْ فِيهِ تَخْتَلِفُونَ
91. And fulfill the covenants (taken in the Name of) Allah when you have taken them, and do not break the oaths after you have confirmed them - and indeed you have appointed Allah as your guarantor. Verily, Allah knows what you do. 92. And do not be like the one who undoes the thread which she has spun, after it has become strong, by taking your oaths as a means of deception among yourselves when one group is more numerous than another group. Allah only tests you by this, and on the Day of Resurrection, He will certainly clarify that which used to differ over. This is one of the commands of Allah, to fulfill covenants, keep promises and to fulfill oaths after confirming them. Thus Allah says: