And Leah's servant Zilpah bore Jacob a son.

Genesis 30:9
When Leah saw that she had stopped having children, she gave her servant Zilpah to Jacob as a wife.

Genesis 30:11
Then Leah said, "How fortunate!" So she named him Gad.

Genesis 35:26
And the sons of Leah's maidservant Zilpah were Gad and Asher. These are the sons of Jacob, who were born to him in Paddan-aram.

And Zilpah Leah's maid bore Jacob a son.