Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:2109Muḥammad b. Abū ʿUmar al-ʿAdanī > Sufyān b. ʿUyaynah > Abū al-Zaʿrāʾ ʿAmr b. ʿAmr from his uncle Abū al-Aḥwaṣ ʿAwf b. Mālik al-Jushamī from his father

"I said: 'O Messenger of Allah, my cousin comes to me and I swear that I will not give him anything or uphold the ties of kinship with him.' He said: 'Offer expiation for what you swore about.'"  

ابن ماجة:٢١٠٩حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عُمَرَ الْعَدَنِيُّ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ حَدَّثَنَا أَبُو الزَّعْرَاءِ عَمْرُو بْنُ عَمْرٍو عَنْ عَمِّهِ أَبِي الأَحْوَصِ عَوْفِ بْنِ مَالِكٍ الْجُشَمِيِّ عَنْ أَبِيهِ قَالَ

قُلْتُ يَا رَسُولَ اللَّهِ يَأْتِينِي ابْنُ عَمِّي فَأَحْلِفُ أَنْ لاَ أُعْطِيَهُ وَلاَ أَصِلَهُ قَالَ كَفِّرْ عَنْ يَمِينِكَ