Genesis 41:17-21

So Pharaoh spoke to Joseph, “In my dream, behold, I was standing on the bank of the Nile; and behold, seven cows, fat and sleek came up out of the Nile, and they grazed in the marsh grass. Lo, seven other cows came up after them, poor and very ugly and gaunt, such as I had never seen for ugliness in all the land of Egypt; and the lean and ugly cows ate up the first seven fat cows. Yet when they had devoured them, it could not be detected that they had devoured them, for they were just as ugly as before. Then I awoke.