´It was narrated from Abu Hurairah that the Prophet said:` "Do not make vows, for a vow does not have any impact on the Qadar. Rather it is just a means of taking wealth from the miserly."
Hadith Referenceسنن نسائي / كتاب الأيمان والنذور / 3836
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم