The Prophet (ﷺ) said, "Whoever vows that he will be obedient to Allah, should remain obedient to Him; and whoever made a vow that he will disobey Allah, should not disobey Him."
Sahih al-Bukhari Book 83, Hadith 73
← Previous Hadith `Imran bin Hussain said, "The Prophet (ﷺ) said, 'The best of you (people) are my generation, and the second best will be those who will follow them, and then those who will follow the second generation." `Imran added, "I do not remember whether he mentioned two or three (generations) after his generation. He added, 'Then will come some people who will make vows but will not fulfill them; and they will be dishonest and will not be trustworthy, and they will give their witness without being asked to give their witness, and fatness will appear among them.' "

Sahih al-Bukhari Book 83, Hadith 72 Next Hadith → `Umar said "O Allah's Messenger (ﷺ)! I vowed to perform I`tikaf for one night in Al-Masjid-al-Haram, during the Pre-Islamic Period of ignorance (before embracing Islam). "The Prophet (ﷺ) said, "Fulfill your vow." Ibn `Umar said to the lady, "Pray on her behalf." Ibn `Abbas said the same.

Sahih al-Bukhari Book 83, Hadith 74