Deuteronomy 23:21-23

23:21 When you make a vow to the Lord your God you must not delay in fulfilling it, for otherwise he will surely hold you accountable as a sinner. 23:22 If you refrain from making a vow, it will not be sinful. 23:23 Whatever you vow, you must be careful to do what you have promised, such as what you have vowed to the Lord your God as a freewill offering.

Ecclesiastes 9:2

9:2 Everyone shares the same fate –

the righteous and the wicked,

the good and the bad,

the ceremonially clean and unclean,

those who offer sacrifices and those who do not.

What happens to the good person, also happens to the sinner;

what happens to those who make vows, also happens to those who are afraid to make vows.

James 5:12

5:12 And above all, my brothers and sisters, do not swear, either by heaven or by earth or by any other oath. But let your “Yes” be yes and your “No” be no, so that you may not fall into judgment.