Genesis 30:6-10

And Rachel said, God hath judged me, and hath also heard my voice, and hath given me a son: therefore called she his name Dan.

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

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

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

And Zilpah Leah’s maid bare Jacob a son.