Genesis 41:34-36

And let the king also appoint officers over the land, who should take one-fifth of all the food that is grown during the seven good years. They should gather all the food that is produced during the good years that are coming, and under the king’s authority they should store the grain in the cities and guard it. That food should be saved to use during the seven years of hunger that will come on the land of Egypt. Then the people in Egypt will not die during the seven years of hunger.”