What Jacob did to others, Jacob now endures from others—though in the long run—sometimes the very long run—God will bless Jacob and more than make up for his suffering.
As Jacob deceived his father and stole his elder brother’s role, so now Rachel’s father deceives Jacob and gives Rachel’s role to his elder daughter (29:23), protecting the right of the literal firstborn (here, Leah) that Jacob had taken had taken from the firstborn of his family of origin (there, Esau). The custom that the firstborn is married first (29:26) fits the birthright going to the first; Jacob got Esau’s birthright for lentils but now has to work an extra seven years for Rachel. In 29:25, Jacob protests that Laban “tricked” him—using the same Hebrew root that in 27:35 Jacob’s father used to describe what Jacob had done to Esau.
Moreover, Jacob finds that even when he has Laban’s daughters, he’s not able to leave town with them. From Laban’s perspective, he will soon learn, the daughters and their offspring remain Laban’s (31:43). Jacob had left father and mother and cleaved to his wife (cf. 2:24), but Laban didn’t intend to let his son-in-law leave him. One can understand Laban’s rationale without approving of it. Abraham’s servant wanted to take Rebekah as a wife for Isaac immediately (Gen 24:54-56), and after that Laban never saw his sister Rebekah again. It thus makes some psychological sense that he does not want his daughters to leave with Jacob (Gen 29:27; 30:27); once Jacob returns to Canaan, Laban will probably never see his daughters again (cf. 31:50, 52).
More than Laban’s love for his daughters was his love of the prosperity that Jacob brought. Laban also wanted Jacob’s continued service and he bought it for seven more years by giving him Rachel (29:26). The daughters knew that their father had “sold” them in return for Jacob’s prosperous service (31:15). Yet Laban didn’t treat Jacob like a son; he kept changing his wages, trying to get as much as possible from Jacob for as little as possible (31:7, 41).
Nevertheless, God would see Jacob’s affliction and help him (31:12, 42). Indeed, in the game of deception, Jacob would come out ahead (31:20), though only because God acted on his behalf (31:24). (This does not provide an ideal model for us today, but God worked on behalf of Jacob within the setting with which he lived.) Laban’s oppression may provide an extra incentive for Jacob to return to the land that God had promised him (cf. 31:2-3). But given Laban’s determination, only God can make that happen safely.
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