Genesis 30:3-8
She said,“ Behold, my maid Bilhah. Go in to her, that she may bear on my knees, and I also may obtain children by her.”She gave him Bilhah her servant as wife, and Jacob went in to her.Bilhah conceived, and bore Jacob a son.Rachel said,“ God has judged me, and has also heard my voice, and has given me a son.” Therefore she called his name Dan.Bilhah, Rachel’s servant, conceived again, and bore Jacob a second son.Rachel said,“ I have wrestled with my sister with mighty wrestlings, and have prevailed.” She named him Naphtali.