Genesis 30:1-5

When Rachel realized that she wasn’t having any children for Jacob, she became jealous of her sister. She told Jacob, “Give me sons or I’ll die!” Jacob got angry with Rachel and said, “Am I God? Am I the one who refused you babies?” Rachel said, “Here’s my maid Bilhah. Sleep with her. Let her substitute for me so I can have a child through her and build a family.” So she gave him her maid Bilhah for a wife and Jacob slept with her. Bilhah became pregnant and gave Jacob a son.