Sunan Abi Dawud 3323
سنن أبي داود#3323SahihNarrated 'Uqbah bin 'Amir: The Messenger of Allah (ﷺ) as saying: The atonement for a vow is the same as for an oath. Abu Dawud said: This tradition has also been transmitted by 'Amr b. al-Harith from Ka'b b. 'Alqamah, from Ibn Shamasah on the authority of 'Uqbah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 22:82