The Quran root ح ل ف ḥ-l-f

فَكَيْفَ إِذَا أَصَابَتْهُم مُّصِيبَةٌ بِمَا قَدَّمَتْ أَيْدِيهِمْ ثُمَّ جَاءُوكَ يَحْلِفُونَ بِاللَّهِ إِنْ أَرَدْنَا إِلَّا إِحْسَانًا وَتَوْفِيقًا ٦٢

يَحْلِفُونَ yaḥlifūna · swearing

So how [will it be] when disaster strikes them because of what their hands have put forth and then they come to you swearing by Allāh, "We intended nothing but good conduct and accommodation." (Surah An-Nisa, 4:62)

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 ٨٩

حَلَفْتُمْ ḥalaftum · you have sworn

Allāh will not impose blame upon you for what is meaningless in your oaths, but He will impose blame upon you for [breaking] what you intended of oaths. So its expiation is the feeding of ten needy people from the average of that which you feed your [own] families or clothing them or the freeing of a slave. But whoever cannot find [or afford it] - then a fast of three days [is required]. That is the expiation for oaths when you have sworn. But guard your oaths. Thus does Allāh make clear to you His verses [i.e., revealed law] that you may be grateful. (Surah Al-Ma'idah, 5:89)

وَلَا تُطِعْ كُلَّ حَلَّافٍ مَّهِينٍ ١٠

حَلَّافٍ ḥallāfin · habitual swearer

And do not obey every worthless habitual swearer (Surah Al-Qalam, 68:10)