Deuteronomy 23:17-25

17“No Israelite, whether man or woman, may become a temple prostitute.

18When you are bringing an offering to fulfill a vow, you must not bring to the house of the Lord your God any offering from the earnings of a prostitute, whether a man or a woman, for both are detestable to the Lord your God.

19“Do not charge interest on the loans you make to a fellow Israelite, whether you loan money, or food, or anything else.

20You may charge interest to foreigners, but you may not charge interest to Israelites, so that the Lord your God may bless you in everything you do in the land you are about to enter and occupy.

21“When you make a vow to the Lord your God, be prompt in fulfilling whatever you promised him. For the Lord your God demands that you promptly fulfill all your vows, or you will be guilty of sin.

22However, it is not a sin to refrain from making a vow.

23But once you have voluntarily made a vow, be careful to fulfill your promise to the Lord your God.

24“When you enter your neighbor’s vineyard, you may eat your fill of grapes, but you must not carry any away in a basket.

25And when you enter your neighbor’s field of grain, you may pluck the heads of grain with your hand, but you must not harvest it with a sickle.