Genesis 47:24-26 International Children’s Bible (ICB)
24 At harvest time you must give one-fifth to the king. You may keep four-fifths for yourselves. Use it as seed for the field and as food for yourselves, your families and your children.”
25 The people said, “You have saved our lives. If you like, we will become slaves of the king.”
26 So Joseph made a law in Egypt, which continues today: One-fifth of everything from the land belongs to the king. The only land the king did not get was the priests’ land.