Genesis 16:1,2,6
Now Sarai Abram's wife bore him no children: and she had an handmaid, an Egyptian, whose name was Hagar.
Nave's Topical Index—AKJV

Genesis 30:3,9
And she said, Behold my maid Bilhah, go in to her; and she shall bear on my knees, that I may also have children by her.
Nave's Topical Index—AKJV