Genesis 41:27
27 The seven lean, ugly cows that came up afterward are seven years, and so are the seven worthless head of grain scorched by the east wind: They are seven years of famine.
Genesis 41:35
35 They should collect all the food of these good years the are coming and store up the grain under the authority of Pharaoh, to be kept in the cities for food.
Genesis 41:36
36 This food should be held in reserve for the country, to be used during the seven years of famine that will come upon Egypt, so that the country may not be ruined by the famine."