Genesis 16:1-2

And Sarai, Abram's wife, hath not borne to him, and she hath an handmaid, an Egyptian, and her name is Hagar;

and Sarai saith unto Abram, `Lo, I pray thee, Jehovah hath restrained me from bearing, go in, I pray thee, unto my handmaid; perhaps I am built up from her;' and Abram hearkeneth to the voice of Sarai.