Abu Hurairah reported,

The Messenger of Allah ﷺ said, "Whoever insists on an oath against his family is committing a greater sin. Let him expiate it," meaning by offering the expiation.

Bukhari 6626

Sahih

حدثني إسحاق يعني ابن إبراهيم حدثنا يحيى بن صالح حدثنا معاوية عن يحيى عن عكرمة

عن أبي هريرة قال

قال رسول الله ﷺ من استلج في أهله بيمين فهو أعظم إثما ليبر يعني الكفارة

البخاري 6626صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Oaths and vows
Chapter
Allah's saying, "Allah will not impose blame upon you for what is meaningless in your oaths, but He will impose blame upon you for oaths you have made binding. So its expiation is the feeding of ten needy people from the Awsat of what you feed your own families or clothing them or the freeing of a Raqaba. But whoever cannot find the means, then a fast of three days. That is the expiation for oaths when you have sworn. And guard your oaths. Thus does Allah make clear to you His verses that you may be grateful."
Numbering
Darussalam 6626
Bukhari 6626