Genesis 30:1-3

When Rachel saw that she was not having children for Jacob, she envied her sister Leah. She said to Jacob, “Give me children, or I’ll die!” Jacob became angry with her and said, “Can I do what only God can do? He is the one who has kept you from having children.” Then Rachel said, “Here is my slave girl Bilhah. Have sexual relations with her so she can give birth to a child for me. Then I can have my own family through her.”