Genesis 15:3
"And Abram said, Behold, to me thou hast given no seed: and, lo, one born in my house is mine heir."
Cross References (ranked by relevance)
Genesis 14:14
And when Abram heard that his brother was taken captive, he armed his trained servants, born in his own house, three hundred and eighteen, and pursued them unto Dan.
Proverbs 29:21
He that delicately bringeth up his servant from a child shall have him become his son at the length.
Ecclesiastes 2:7
I got me servants and maidens, and had servants born in my house; also I had great possessions of great and small cattle above all that were in Jerusalem before me: