Zilpah.... wife. This was strictly in accordance with the Code of Khammurabi, 145. Compare Genesis 16:1-3; Genesis 30:3; Genesis 30:4. See App-15.
Related Commentaries of Genesis 30:9
Genesis 30:9
9 When Leah saw that she had left bearing, she took Zilpah her maid, and gave her Jacob to wife.