Genesis 41:17-21

Then Pharaoh said to Joseph: “Behold, in my dream I stood on the bank of the river. Suddenly seven cows came up out of the river, fine looking and fat; and they fed in the meadow. Then behold, seven other cows came up after them, poor and very ugly and gaunt, such ugliness as I have never seen in all the land of Egypt. And the gaunt and ugly cows ate up the first seven, the fat cows. When they had eaten them up, no one would have known that they had eaten them, for they were just as ugly as at the beginning. So I awoke.