Exodus 23:9-11

9“Also you shall not oppress a stranger, for you know the heart of a stranger, because you were strangers in the land of Egypt.

10“Six years you shall sow your land and gather in its produce,

11but the seventh year you shall let it rest and lie fallow, that the poor of your people may eat; and what they leave, the beasts of the field may eat. In like manner you shall do with your vineyard and your olive grove.