Abraham Had Two Sons
Abraham had two sons; one by a bond-maid, the other by a free woman. (Gal. 4: 22.)
Abraham Had but One Son
By faith, Abraham when he was tried offered up Isaac,... his only begotten son. (Heb. 11: 17.)
Keturah Was Abraham’s Wife
Then again Abraham took a wife, and her name was Keturah. (Gen. 25: 1.)
Keturah Was Abraham’s Concubine
The sons of Keturah, Abraham’s concubine. (1 Chron. 1: 32.)
Abraham Begat a Son When He Was a Hundred Years Old, by the Interposition of Providence
Sarah conceived and bare Abraham a son in his old age, at the set time of which God had spoken to him. (Gen. 21: 2.)
And being not weak in the faith, he considered not his own body, now dead, when he was about a hundred years old. (Rom. 4: 19.)
Therefore sprang there from one, and him as good as dead, so many as the stars of the sky. (Heb. 11: 12.)