´It was narrated from Abul-Ahwas 'Awf bin Malik Al- Jushami that his father said:` "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.'"
Related hadith on this topic
Explanation & Benefits
Hafiz Muhammad Ameen
1) In this hadith, encouragement towards ihsan (excellence in conduct) has been given, that if someone does evil to another, then the latter should respond to the evildoer with gentleness.
2) If someone has sworn an oath to sever ties of kinship (qat‘ al-rahm), then he will give its expiation (kaffarah) and will maintain the ties of kinship (silat al-rahm).
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3819