Genesis 47:24-26 Complete Jewish Bible (CJB)
24 When harvest time comes, you are to give twenty percent to Pharaoh; eighty percent will be yours to keep for seed to plant in the fields, as well as for your food and for that of your households and your little ones.”
(Maftir) 25 They replied, “You have saved our lives! So if it pleases my lord, we will be Pharaoh’s slaves.” 26 Yosef made it a law for the country of Egypt, valid to this day, that Pharaoh should have twenty percent. Only the property belonging to the priests did not become Pharaoh’s.