Deuteronomy 23:22 in the King James Version
But if thou shalt forbear to vow, it shall be no sin in thee.
Context
21 When you vow a vow to the LORD your God, you shall not be slack to pay it, for the LORD your God will surely require it of you; and it would be sin in you.
22 But if you refrain from making a vow, it shall be no sin in you.
23 You shall observe and do that which has gone out of your lips. Whatever you have vowed to the LORD your God as a free will offering, which you have promised with your mouth, you must do.