Sayyidah Aisha (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) said: Whoever makes a vow to obey Allah should obey Him (i.e., fulfill the vow), and whoever makes a vow to disobey Allah should not disobey Him (i.e., should not fulfill the vow).
Hadith Referenceالمنتقى ابن الجارود / كتاب الطلاق / 934
Hadith Gradingغلام مصطفےٰ ظهير امن پوري:صحيح
Hadith Takhrijاز غلام مصطفےٰ ظهير امن پوري:«صحيح البخاري : 6696، 6700، موطأ امام مالك : 2/476۔»