Genesis 16:3,15
And Sarai Abram's wife took Hagar her maid the Egyptian, after Abram had dwelled ten years in the land of Canaan, and gave her to her husband Abram to be his wife.
Nave's Topical Index—AKJV

Galatians 4:22
For it is written, that Abraham had two sons, the one by a female slave, the other by a free woman.
Nave's Topical Index—AKJV