According to Ibn Kathir, Jacob knew that Joseph would someday become extremely important and would be in a high position, both in this world and the next—he recognized that the stars represented his brothers and the sun and moon represented himself and Joseph's mother, Rachel. Jacob advised Joseph to keep the dream to himself in order to protect him from the jealousy of his brothers, who were already unhappy about the love Jacob felt for Joseph. Ya'qub foresaw that Yusuf would be one through whom the prophecy of his grandfather, Ibrahim (Abraham), would be fulfilled, in that his offspring would keep the light of Abraham's house alive and spread God's message to mankind. Abu Ya'ala interpreted Jacob's reaction as an understanding that the planets, sun and moon bowing to Joseph representing "something dispersed which God united."