Genesis 46:18
These were all sons from Zilpah, whom Laban had given to his daughter Leah. She bore these sixteen children for Jacob.
Genesis 29:24
Laban also gave his servant woman Zilpah to Leah to be her maidservant.
Genesis 30:9-13
When Leah saw that she had stopped bearing children, she took her woman servant Zilpah and gave her to Jacob as a wife.
Genesis 35:26
Leah's servant Zilpah's sons were Gad and Asher. These were Jacob's sons who were born to him while he lived in Paddan-aram.
Exodus 1:4
Dan, Naphtali, Gad, and Asher.