Sahih Muslim Book 27, Hadith 38

This is what Abu Huraira reported to us from Allah's Messenger (ﷺ), and he narrated a hadith and (one) of them is that Allah's Messenger (ﷺ) said: I swear by Allah, it is more sinful in Allah's sight for one of you to persist in an oath regarding his family than payment of its expiation which Allah has imposed upon him (for breaking the oath).

Previous Hadith

" Every one of them giving birth to a child, who would have fought in the cause of Allah."

Sahih Muslim Book 27, Hadith 37
Next Hadith

Messenger of Allah, I had taken a vow during the days of Ignorance (Jahiliyya) that I would observe I'tikaf for a night in the Sacred Mosque. He (the Holy Prophet) said: Fulfil your vow.

Sahih Muslim Book 27, Hadith 39