Deuteronomy 23:22-24

22But if you refrain from vowing, you will not be guilty of sin. 23You shall be careful to do what has passed your lips, for you have voluntarily vowed to the  Lord your God what you have promised with your mouth.

24“If you go into your neighbor’s vineyard, you may eat your fill of grapes, as many as you wish, but you shall not put any in your bag.
Copyright information for ESV