Qatada قتادة · Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)

The Prophet (ﷺ) said to me: 'Abd al-Rahman b. Samurah, when you swear an oath and consider something else to be better than it, do the thing that is beter and make atonement for your oath. Abu Dawud said: I heard Ahmad (b. Hanbal) permitting to make atonement before breaking the oath.

A man came to Prophet (ﷺ) and said: Messenger of Allah, my sister has taken a vow to perform hajj on foot. The Prophet (ﷺ) said: Allah gets no good from the affliction your sister imposed on herself, so let her perform hajj riding and make atonement for her oath.

That the sister of 'Uqbah b. 'Amir took vow to walk on foot to the Ka'bah. Thereupon the Prophet (ﷺ) ordered her to ride and slaughter a sacrificial animal.

That when the Prophet (ﷺ) was informed that the sister of 'Uqbah b. 'Amir had taken a vow to perform Hajj on foot, he said: Allah is not in need of her vow. So ask her to ride. Abu Dawud said: Sa'ib b. 'Arubah has transmitted a similar tradition. Khalid has also transmitted a similar tradition on the authority of 'Ikrimah from the Prophet (ﷺ).