Reference

Genesis 30:9

When Leah saw that she had left bearing, she took Zilpah her maid, and gave her Jacob to wife.
7

And Bilhah Rachel’s maid conceived again, and bare Jacob a second son.

8

And Rachel said, With great wrestlings have I wrestled with my sister, and I have prevailed: and she called his name Naphtali.

9

When Leah saw that she had left bearing, she took Zilpah her maid, and gave her Jacob to wife.

10

And Zilpah Leah’s maid bare Jacob a son.

11

And Leah said, A troop cometh: and she called his name Gad.