Verse 4. - And she gave him Bilhah her handmaid to wife: and Jacob went in unto her. "Whence we gather that there is no end of sin where once the Divine institution of marriage is neglected" (Calvin). Jacob began with polygamy, and is now drawn into concubinage. Though God overruled this for the development of the seed of Israel, he did not thereby condone the offense of either Jacob or Rachel.

30:1-13 Rachel envied her sister: envy is grieving at the good of another, than which no sin is more hateful to God, or more hurtful to our neighbours and ourselves. She considered not that God made the difference, and that in other things she had the advantage. Let us carefully watch against all the risings and workings of this passion in our minds. Let not our eye be evil towards any of our fellow-servants, because our Master's is good. Jacob loved Rachel, and therefore reproved her for what she said amiss. Faithful reproofs show true affection. God may be to us instead of any creature; but it is sin and folly to place any creature in God's stead, and to place that confidence in any creature, which should be placed in God only. At the persuasion of Rachel, Jacob took Bilhah her handmaid to wife, that, according to the usage of those times, her children might be owned as her mistress's children. Had not Rachel's heart been influenced by evil passions, she would have thought her sister's children nearer to her, and more entitled to her care than Bilhah's. But children whom she had a right to rule, were more desirable to her than children she had more reason to love. As an early instance of her power over these children, she takes pleasure in giving them names that carry in them marks of rivalry with her sister. See what roots of bitterness envy and strife are, and what mischief they make among relations. At the persuasion of Leah, Jacob took Zilpah her handmaid to wife also. See the power of jealousy and rivalship, and admire the wisdom of the Divine appointment, which joins together one man and one woman only; for God hath called us to peace and purity.And she gave him Bilhah her handmaid,.... To be enjoyed as a wife, though she was no other than a concubine; yet such were sometimes called wives, and were secondary ones, and were under the proper lawful wife, nor did their children inherit; but those which Jacob had by his wives' maids did inherit with the rest:

and Jacob went in unto her; consenting to what Rachel his wife proposed to him: having concubines, as well as more wives than one, were not thought criminal in those times, and were suffered of God, and in this case for the multiplication of Jacob's seed; and perhaps he might the more readily comply with the motion of his wife, from the example of his grandfather Abraham, who took Hagar to wife at the instance of Sarah.