Narrated Abdullah ibn Abbas: The Prophet (ﷺ) said: If anyone takes a vow but does not name it, its atonement is the same as that for an oath, if anyone takes a vow to do an act of disobedience, its atonement is the same as that for an oath, if anyone takes a vow he is unable to fulfill, its atonement is the same as that for an oath, but if anyone takes a vow he is able to fulfill, he must do so. Abu Dawud said: This tradition has been transmitted by Waki' and others on the authority of 'Abd Allah b. Sa'id b. Abi al-Hind, but they traced it no farther back than Ibn 'Abbas
Narrated '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
Hadithi 3324 — Sunan Abu Dawud 22:83
DaifSahihSahihSahih
حَدَّثَنَا مُحَمَّدُ بْنُ عَوْفٍ، أَنَّ سَعِيدَ بْنَ الْحَكَمِ، حَدَّثَهُمْ أَخْبَرَنَا يَحْيَى بْنُ أَيُّوبَ، حَدَّثَنِي كَعْبُ بْنُ عَلْقَمَةَ، أَنَّهُ سَمِعَ ابْنَ شِمَاسَةَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم مِثْلَهُ .
A similar tradition has also been transmitted by 'Uqbah b. 'Amir from the Prophet (ﷺ) through a different chain of narrators
Hadithi 3325 — Sunan Abu Dawud 22:84
SahihSahihSahihSahih Bukhari (2032) Sahih Muslim (1656)
Narrated Ibn 'Umar:That 'Umar said: Messenger of Allah, I took a vow in pre-Islamic times that I would stay in the sacred mosque (Masjid Haram) as a devotion (i'tikaf). The Prophet (ﷺ) said: Fulfill your vow