Genesis 30:3-5, 9-13

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.

When Leah saw that she wasn’t having any more children, she gave her maid Zilpah to Jacob for a wife. Zilpah had a son for Jacob. Leah said, “How fortunate!” and she named him Gad (Lucky). When Leah’s maid Zilpah had a second son for Jacob, Leah said, “A happy day! The women will congratulate me in my happiness.” So she named him Asher (Happy).