Therefore he treated Abram well for her sake; and he gave him sheep, oxen, male donkeys, male servants and female servants, female donkeys, and camels.
But God said to Abraham, “Do not be distressed because of the boy and your slave woman; whatever Sarah tells you, listen to her, for through Isaac your descendants shall be named.
This is speaking allegorically, for these women are two covenants: one coming from Mount Sinai giving birth to children who are to be slaves; she is Hagar.