Deuteronomy 23: 21-25
21 If you make a vow to Yahweh your Elohim, don’t avoid keeping it. Yahweh your Elohim expects you to keep it. You would be guilty of a sin if you didn’t. 22 If you didn’t make a vow, you would not be guilty. 23 Make sure you do what you said you would do in your vow. You freely chose to make your vow to Yahweh your Elohim.
24 If you go into your neighbor’s vineyard, you may eat as many grapes as you like until you’re full. But never put any in your basket. 25 If you go into your neighbor’s grain field, you may pick grain by hand. But never use a sickle to cut your neighbor’s grain.