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 Isaac grew old He could  hardly  see anymore. He wanted to give his blessing to older son. Esau would then become the leader of the people when Isaac died. But God had told Rebekah  that the younger son would be the leader. So she made Jacob dress in Esau's best clothes. In addition, then she put hairy hairy goat skins on Jacob's arms and hands to make them feel like Esau's. When Isaac called for Esau, Rebekah sent Jacob into the tent instead.  Therefore, Isaac knew the smell of Esau's clothes. He touched Jacob's hands and thought the hands of Esau. He gave Jacob his blessing and made him the leader of the people of Abraham.