And Isaac was 40 years old. Why? Because he was 37 years old when he was bound (to be sacrificed), on account of which his mother, Sarah, died. And at that same time, Abraham was told that Rebecca had been born, and Isaac waited 3 years for Rebecca, because a woman is not suitable for marriage younger than 3 years old. Sister of Laban the Aramean. And since the verse already said, "the daughter of Bethuel the Aramean", didn't I know that she is the sister of Laban? And wasn't it already stated, "and to Rebecca's brother, and his name is Laban", rather it is to teach you of Rebecca's righteousness, that she was the daughter of Bethuel, who was a deceiver, and the sister of Laban, who was a deceiver, and she did not learn from their bad deeds.