Genesis 41:27-31

The seven thin, scrawny cows that came up later and the seven thin heads of grain, withered by the east wind, represent seven years of famine. “This will happen just as I have described it, for God has revealed to Pharaoh in advance what he is about to do. The next seven years will be a period of great prosperity throughout the land of Egypt. But afterward there will be seven years of famine so great that all the prosperity will be forgotten in Egypt. Famine will destroy the land. This famine will be so severe that even the memory of the good years will be erased.