Verse 89

لَا يُؤَاخِذُكُمُ ٱللَّهُ بِٱللَّغْوِ فِىٓ أَيْمَـٰنِكُمْ وَلَـٰكِن يُؤَاخِذُكُم بِمَا عَقَّدتُّمُ ٱلْأَيْمَـٰنَ فَكَفَّـٰرَتُهُۥٓ إِطْعَامُ عَشَرَةِ مَسَـٰكِينَ مِنْ أَوْسَطِ مَا تُطْعِمُونَ أَهْلِيكُمْ أَوْ كِسْوَتُهُمْ أَوْ تَحْرِيرُ رَقَبَةٍ فَمَن لَّمْ يَجِدْ فَصِيَامُ ثَلَـٰثَةِ أَيَّامٍ ذَٰلِكَ كَفَّـٰرَةُ أَيْمَـٰنِكُمْ إِذَا حَلَفْتُمْ وَٱحْفَظُوٓا۟ أَيْمَـٰنَكُمْ كَذَٰلِكَ يُبَيِّنُ ٱللَّهُ لَكُمْ ءَايَـٰتِهِۦ لَعَلَّكُمْ تَشْكُرُونَ

God does not hold you responsible for your casual oaths, however, He holds you responsible for your binding oaths. Therefore its atonement is to feed ten poor people from what you usually feed your own family, or clothe them, or free a slave, however, if one cannot find one, then fast three days. This is atonement for your unfulfilled oaths that you promised. And you shall fulfill your oaths. God thus clarifies His Signs for you that you may become appreciative.