Genesis 47:20-25

So Joseph bought up all the farms in Egypt for Pharaoh. Every Egyptian sold his land—the famine was that bad. That’s how Pharaoh ended up owning all the land and the people ended up slaves; Joseph reduced the people to slavery from one end of Egypt to the other. Joseph made an exception for the priests. He didn’t buy their land because they received a fixed salary from Pharaoh and were able to live off of that salary. So they didn’t need to sell their land. Joseph then announced to the people: “Here’s how things stand: I’ve bought you and your land for Pharaoh. In exchange I’m giving you seed so you can plant the ground. When the crops are harvested, you must give a fifth to Pharaoh and keep four-fifths for yourselves, for seed for yourselves and your families—you’re going to be able to feed your children!” They said, “You’ve saved our lives! Master, we’re grateful and glad to be slaves to Pharaoh.”