«من نذر أن يطيع الله فليطعه ومن نذر أن يعصي الله فلا يعصه»
The Prophet (peace and blessings be upon him) said:
"Whoever vows to obey Allah, let him obey Him; and whoever vows to disobey Allah, let him not disobey Him."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 6565