"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.'"
Sunan Ibn Majah Book 11, Hadith 20
← Previous Hadith the Messenger of Allah (ﷺ), said: "Whoever swears an oath then sees that something else is better than it, let him do that which is better and offer expiation for what he swore about. "

Sunan Ibn Majah Book 11, Hadith 19 Next Hadith → "Whoever takes an oath to cut off the ties of kinship, or to do something that is not right, the fulfillment of his vow is not to do that."

Sunan Ibn Majah Book 11, Hadith 21