(23) باب مَنْ رَأَى عَلَيْهِ كَفَّارَةً إِذَا كَانَ فِي مَعْصِيَةٍ
Narrated Aisha, Ummul Mu'minin:
The Prophet (ﷺ) as saying: No vow must be taken to do an act of disobedience, and the atonement for it is the same as for an oath.
Reference: Sunan Abi Dawud 3290
In-book reference: Book 22, Hadith 49
English translation: Book 21, Hadith 3284