Genesis 29:27

Fulfill her week - The marriage feast, it appears, lasted seven days; it would not therefore have been proper to break off the solemnities to which all the men of the place had been invited, Genesis 29:22, and probably Laban wished to keep his fraud from the public eye; therefore he informs Jacob that if he will fulfill the marriage week for Leah, he will give him Rachel at the end of it, on condition of his serving seven other years. To this the necessity of the case caused Jacob to agree; and thus Laban had fourteen years' service instead of seven: for it is not likely that Jacob would have served even seven days for Leah, as his affection was wholly set on Rachel, the wife of his own choice. By this stratagem Laban gained a settlement for both his daughters. What a man soweth, that shall he reap. Jacob had before practiced deceit, and is now deceived; and Laban, the instrument of it, was afterwards deceived himself.

29:27 We will give thee this also - Hereby he drew Jacob into the sin and snare, and disquiet of multiplying wives. Jacob did not design it, but to have kept as true to Rachel as his father had done to Rebekah; he that had lived without a wife to the eighty fourth year of his age could then have been very well content with one: but Laban to dispose of his two daughters without portions, and to get seven years service more out of Jacob, thus imposeth upon him, and draws him into such a strait, that he had some colourable reason for marrying them both.