Genesis 41

Two years later, Pharoah had a dream of lean cows eating up fat cows. He also had a dream of lean ears of grain eating the fat ears. The cupbearer remembered Joseph and explained to Pharoah that Joseph can interpret dreams.

Once Joseph revealed that God was sending a warning that seven years of famine would come after the seven years of plenty, Pharoah placed him in a position of power in order to have a plan in place. Joseph was promoted to second-in-command in all of Egypt.