Deuteronomy 23:21
When you shall vow a vow to the LORD your God, you shall not slack to pay it: for the LORD your God will surely require it of you; and it would be sin in you.
Torrey's Topical Textbook—AKJV

Ecclesiastes 5:4
When you vow a vow to God, defer not to pay it; for he has no pleasure in fools: pay that which you have vowed.
Torrey's Topical Textbook—AKJV