Genesis 46:18

These [are] the sons of Zilpah, whom Laban gave to Leah his
daughter
To be her maid, when she was married to Jacob, by whom he had Gad and Asher: and these she bare unto Jacob, [even] sixteen souls;
not that Zilpah bare sixteen children to Jacob, for she bore but two; but the children and grandchildren of these two with them made sixteen.