15 Leah said, "Wasn't it enough that you got my husband away from me? And now you also want my son's mandrakes?" Rachel said, "All right. I'll let him sleep with you tonight in exchange for your son's love-apples." 16 When Jacob came home that evening from the fields, Leah was there to meet him: "Sleep with me tonight; I've bartered my son's mandrakes for a night with you." So he slept with her that night.
Matthew Henry's Commentary on Genesis 30:15-16
Commentary on Genesis 30:14-24
(Read Genesis 30:14-24)
The desire, good in itself, but often too great and irregular, of being the mother of the promised Seed, with the honour of having many children, and the reproach of being barren, were causes of this unbecoming contest between the sisters. The truth appears to be, that they were influenced by the promises of God to Abraham; whose posterity were promised the richest blessings, and from whom the Messiah was to descend.