Genesis 30:5

Jacob’s anger burned against Rachel, and he said, “Am I in God’s place, who has withheld from you the fruit of the womb?”

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.

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.