لَا يُؤَاخِذُكُمُ اللَّهُ بِاللَّغْوِ فِي أَيْمَانِكُمْ وَلَٰكِن يُؤَاخِذُكُم بِمَا عَقَّدتُّمُ الْأَيْمَانَ ۖ فَكَفَّارَتُهُ إِطْعَامُ عَشَرَةِ مَسَاكِينَ مِنْ أَوْسَطِ مَا تُطْعِمُونَ أَهْلِيكُمْ أَوْ كِسْوَتُهُمْ أَوْ تَحْرِيرُ رَقَبَةٍ ۖ فَمَن لَّمْ يَجِدْ فَصِيَامُ ثَلَاثَةِ أَيَّامٍ ۚ ذَٰلِكَ كَفَّارَةُ أَيْمَانِكُمْ إِذَا حَلَفْتُمْ ۚ وَاحْفَظُوا أَيْمَانَكُمْ ۚ كَذَٰلِكَ يُبَيِّنُ اللَّهُ لَكُمْ آيَاتِهِ لَعَلَّكُمْ تَشْكُرُونَ (89)
(5:89) Allah does not take you to task for the oaths you utter vainly, but He will certainly take you to task for the oaths you have sworn in earnest. The expiation (for breaking such oaths) is either to feed ten needy persons with more or less the same food as you are wont to give to your families, or to clothe them, or to set free from bondage the neck of one man; and he who does not find the means shall fast for three days. This shall be the expiation for your oaths whenever you have sworn (and broken them.) *106 But do keep your oaths. *107 Thus does Allah make clear to you His commandments; maybe you will be grateful.
*106). Since some people had taken an oath prohibiting for themselves the things which He had permitted, God laid down this injunction regarding oaths made inadvertently. The injunction makes it unnecessary to feel bound by the terms of inadvertent oaths, and for which one will not be reproached by God. And if a person had deliberately made an oath which entails sin he should not abide by his oath and should expiate it (see Towards Understanding the Qur'an, vol. I, Surah 2, nn. 243-4; for expiation see Surah 4, n. 125 above).
*107). To be mindful of one's oaths has several meanings. First, one should make proper use of oaths and should not employ them either frivolously or sinfully. Second, when a person takes an oath, he should take care not to forget it lest he be led to break it. Third, when a man deliberately takes an oath regarding something sound in itself he should pay the penalty if he happens to violate it.