Genesis 41:17-21

Then the king said to Joseph, “In my dream I was standing on the bank of the Nile River. I saw seven fat and beautiful cows that came up out of the river and ate the grass. Then I saw seven more cows come out of the river that were thin and lean and ugly—the worst looking cows I have seen in all the land of Egypt. And these thin and ugly cows ate the first seven fat cows, but after they had eaten the seven cows, no one could tell they had eaten them. They looked just as thin and ugly as they did in the beginning. Then I woke up.