When you come into your neighbor's standing grain, you may pluck the heads with your hand, but you shall not use a sickle on your neighbor's standing grain.
Deuteronomy 23:25
Surrounding context
23:24 "When you come into your neighbor's vineyard, you may eat your fill of grapes at your pleasure, but you shall not put any in your container.
23:25 When you come into your neighbor's standing grain, you may pluck the heads with your hand, but you shall not use a sickle on your neighbor's standing grain.