Abu Musa (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "Verily, I swear by Allah, if Allah wills, I shall not swear to do something but that if I consider something else to be better than it, then I shall make expiation for my oath and adopt the thing that is better."[Al-Bukhari and Muslim]. (ES)
App reference (ES): Book 18, Hadith 207 (ES)
Arabic/English book reference (ES): Book 18, Hadith 1717 (ES)