 According to Rabbi Simeon, Jacob wished to reveal to his sons what would happen in the end of the days, but just then, the Shechinah departed from him.So Jacob said that perhaps, Heaven forefend, he had fathered a son who was unworthy to hear the prophecy, just as Abraham had fathered Ishmael or Isaac had fathered Esau.But his sons answered him (in the words of ), "Hear O Israel, the Lord our God, the Lord is One," explaining that just as there was only One in Jacob's heart, so there was only One in their hearts.