Deuteronomy 23:19-25

19You must not charge interest on a loan to your fellow Israelite, whether on money, food, or anything else that has been loaned with interest.

20You may lend with interest to a foreigner, but not to your fellow Israelite; if you keep this command the Lord your God will bless you in all you undertake in the land you are about to enter to possess.

21When you make a vow to the Lord your God you must not delay in fulfilling it, for otherwise he will surely hold you accountable as a sinner.

22If you refrain from making a vow, it will not be sinful.

23Whatever you vow, you must be careful to do what you have promised, such as what you have vowed to the Lord your God as a freewill offering.

24When you enter the vineyard of your neighbor you may eat as many grapes as you please, but you must not take away any in a container.

25When you go into the ripe grain fields of your neighbor you may pluck off the kernels with your hand, but you must not use a sickle on your neighbor’s ripe grain.