Genesis 17:13

But every man’s servant that is bought for money, when thou hast circumcised him, then shall he eat thereof.

And the Midianites sold him into Egypt unto Potiphar, an officer of Pharaoh’s, and captain of the guard.

And I said unto them, We after our ability have redeemed our brethren the Jews, which were sold unto the heathen; and will ye even sell your brethren? or shall they be sold unto us? Then held they their peace, and found nothing to answer.

And he that stealeth a man, and selleth him, or if he be found in his hand, he shall surely be put to death.

If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.

If his master have given him a wife, and she have born him sons or daughters; the wife and her children shall be her master’s, and he shall go out by himself.

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.

And Abram said, Behold, to me thou hast given no seed: and, lo, one born in my house is mine heir.

Come, and let us sell him to the Ishmeelites, and let not our hand be upon him; for he is our brother and our flesh. And his brethren were content.

And Joseph was brought down to Egypt; and Potiphar, an officer of Pharaoh, captain of the guard, an Egyptian, bought him of the hands of the Ishmeelites, which had brought him down thither.

But forasmuch as he had not to pay, his lord commanded him to be sold, and his wife, and children, and all that he had, and payment to be made.

Yet now our flesh is as the flesh of our brethren, our children as their children: and, lo, we bring into bondage our sons and our daughters to be servants, and some of our daughters are brought unto bondage already: neither is it in our power to redeem them; for other men have our lands and vineyards.