"Whoever vows to obey Allah, let him obey Him, and whoever vows to disobey Allah, let him not disobey Him."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ نَذَرَ أَنْ يُطِيعَ اللَّهَ فَلْيُطِعْهُ وَمَنْ نَذَرَ أَنْ يَعْصِيَ اللَّهَ فَلاَ يَعْصِهِ