Genesis 16:1

Sarai and Hagar

1 aNow Sarai, Abram’s wife, had borne him no children. She had a female Egyptian servant whose name was bHagar.

Genesis 24:59

59So they sent away Rebekah their sister and cher nurse, and Abraham’s servant and his men.

Genesis 30:9-12

9When Leah saw that she had ceased bearing children, she took her servant Zilpah and dgave her to Jacob as a wife. 10Then Leah’s servant Zilpah bore Jacob a son. 11And Leah said, e“Good fortune has come!” so she called his name fGad.
 Gad sounds like the Hebrew for  good fortune
12Leah’s servant Zilpah bore Jacob a second son.

Genesis 46:18

18 hThese are the sons of Zilpah, iwhom Laban gave to Leah his daughter; and these she bore to Jacobsixteen persons.

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