Genesis 30:3-9

3She said, “Here’s my servant Bilhah. Sleep with her. She can have children for me, and I can build a family for myself through her.”

4So she gave him her slave Bilhah as his wife, and Jacob slept with her.

5Bilhah became pregnant, and she gave birth to a son for Jacob.

6Rachel said, “Now God has judged in my favor. He has heard my prayer and has given me a son.” So she named him Dan [He Judges].

7Rachel’s slave Bilhah became pregnant again and gave birth to a second son for Jacob.

8Rachel said, “I have had a great struggle  with my sister, and I have won!” So she named him Naphtali [My Struggle].

9When Leah saw that she had stopped having children, she took her slave Zilpah and gave her to Jacob as his wife.