Cross reference
Genesis 46:18
18 These are the sons of Zilpah, whom Laban gave to Leah his daughter, and these she bare unto Jacob, even sixteen souls.
Genesis 29:24
24 And Laban gave unto his daughter Leah Zilpah his maid for an handmaid.
Genesis 30:9-13
9 When Leah saw that she had left bearing, she took Zilpah her maid, and gave her Jacob to wife.
10 And Zilpah Leah's maid bare Jacob a son.
11 And Leah said, A troop cometh: and she called his name Gad.
12 And Zilpah Leah's maid bare Jacob a second son.
13 And Leah said, Happy am I, for the daughters will call me blessed: and she called his name Asher.
Genesis 35:26
26 And the sons of Zilpah, Leah's handmaid: Gad, and Asher: these are the sons of Jacob, which were born to him in Padanaram.
Exodus 1:4
4 Dan, and Naphtali, Gad, and Asher.