Genesis 30:9

When Leah saw that she had stopped bearing, she took Zilpah her maid and gave her to Jacob as wife.

Surrounding context

30:8 Then Rachel said, "With great wrestlings I have wrestled with my sister, and indeed I have prevailed." So she called his name Naphtali.

30:9 When Leah saw that she had stopped bearing, she took Zilpah her maid and gave her to Jacob as wife.

30:10 And Leah's maid Zilpah bore Jacob a son.