Genesis 30:4

4 And she gave him Balla her maid, for a wife to him; and Jacob went in to her.

Genesis 30:4 Meaning and Commentary

Genesis 30:4

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.

Genesis 30:4 In-Context

2 And Jacob was angry with Rachel, and said to her, Am I in the place of God, who has deprived thee of the fruit of the womb?
3 And Rachel said to Jacob, Behold my handmaid Balla, go in to her, and she shall bear upon my knees, and I also shall have children by her.
4 And she gave him Balla her maid, for a wife to him; and Jacob went in to her.
5 And Balla, Rachel's maid, conceived, and bore Jacob a son.
6 And Rachel said, God has given judgment for me, and hearkened to my voice, and has given me a son; therefore she called his name, Dan.

The Brenton translation of the Septuagint is in the public domain.