Genesis 16:3
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

Genesis 25:6
But to the sons of the concubines, which Abraham had, Abraham gave gifts, and sent them away from Isaac his son, while he yet lived, eastward, to the east country.
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1 Chronicles 1:32
Now the sons of Keturah, Abraham's concubine: she bore Zimran, and Jokshan, and Medan, and Midian, and Ishbak, and Shuah. And the sons of Jokshan; Sheba, and Dedan.
Nave's Topical Index—AKJV