Genesis 41:27-31

The seven lean and ugly cows that came up after them are seven years, and the seven empty ears blighted by the east wind are also seven years of famine. It is as I told Pharaoh; God has shown to Pharaoh what he is about to do. There will come seven years of great plenty throughout all the land of Egypt, but after them there will arise seven years of famine, and all the plenty will be forgotten in the land of Egypt. The famine will consume the land, and the plenty will be unknown in the land by reason of the famine that will follow, for it will be very severe.