LXX2012(i)
21 And if you will vow a vow to the Lord your God, you shall not delay to pay it; for the Lord your God will surely require it of you, and [otherwise] it shall be sin in you.
22 But if you should be unwilling to vow, it is not sin in you.
23 You shall observe the words that proceed from between your lips; and as you have vowed a gift to the Lord God, [so] shall you do that which you have spoken with your mouth.