Cross reference
Genesis 46:18
18 These are the sons of Zilpah, whom Laban gave to Leah, his daughter, and these she bore to Jacob, even sixteen souls.
Genesis 29:24
24 Laban gave Zilpah his handmaid to his daughter Leah for a handmaid.
Genesis 30:9-13
9 When Leah saw that she had finished bearing, she took Zilpah, her handmaid, and gave her to Jacob as a wife.
10 Zilpah, Leah's handmaid, bore Jacob a son.
11 Leah said, "How fortunate!" She named him Gad.
12 Zilpah, Leah's handmaid, bore Jacob a second son.
13 Leah said, "Happy am I, for the daughters will call me happy." She named him Asher.
Genesis 35:26
26 The sons of Zilpah (Leah's handmaid): Gad and Asher. These are the sons of Jacob, who were born to him in Paddan Aram.
Exodus 1:4
4 Dan and Naphtali, Gad and Asher.