The Prophet (ﷺ) said, "Whoever vowed to be obedient to Allah, must be obedient to Him; and whoever vowed to be disobedient to Allah, should not be disobedient to Him."
Sahih al-Bukhari Book 83, Hadith 77
← Previous Hadith A man came to the Prophet (ﷺ) and said to him, "My sister vowed to perform the Hajj, but she died (before fulfilling it)." The Prophet (ﷺ) said, "Would you not have paid her debts if she had any?" The man said, "Yes." The Prophet (ﷺ) said, "So pay Allah's Rights, as He is more entitled to receive His rights."

Sahih al-Bukhari Book 83, Hadith 76 Next Hadith → The Prophet (ﷺ) said, "Allah is not in need of this man) torturing himself," when he saw the man walking between his two sons (who were supporting him).

Sahih al-Bukhari Book 83, Hadith 78