Genesis 46:18
These are the sons of Zilpah, whom Laban gave to Leah his daughter; and these she bore to Jacob--sixteen persons.
Genesis 29:24
(Laban gavehis female servant Zilpah to his daughter Leah to be her servant.)
Genesis 30:9-13
When Leah saw that she had ceased bearing children, she took her servant Zilpah and gave her to Jacob as a wife.
Genesis 35:26
The sons of Zilpah, Leah's servant: Gad and Asher. These were the sons of Jacob who were born to him in Paddan-aram.
Exodus 1:4
Dan and Naphtali, Gad and Asher.