Slavery is a social-economic system under which certain persons — known as slaves — are deprived of personal freedom and compelled to perform labor or services. The term also refers to the status or condition of those persons who are treated as the property of another person, household, company, corporation or government. This is referred to as "chattel slavery".
The Bible has many comments about how slavery is to be practiced.
"If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing. If he came in by himself, he shall go out by himself: if he were married, then his wife shall go out with him. 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 if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free: Then his master shall bring him unto the judges; he shall also bring him to the door, or unto the door post; and his master shall bore his ear through with an aul; and he shall serve him for ever." - Exodus 21:2-6 (KJV)
"And if a man smite his servant, or his maid, with a rod, and he die under his hand; he shall be surely punished. Notwithstanding, if he continue a day or two, he shall not be punished: for he is his money." - Exodus 21:20-21 (KJV)
"Both thy bondmen, and thy bondmaids, which thou shalt have, shall be of the heathen that are round about you; of them shall ye buy bondmen and bondmaids. Moreover of the children of the strangers that do sojourn among you, of them shall ye buy, and of their families that are with you, which they begat in your land: and they shall be your possession. And ye shall take them as an inheritance for your children after you, to inherit them for a possession; they shall be your bondmen for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigour." - Leviticus 25:44-46 (KJV)
"A servant will not be corrected by words: for though he understand he will not answer." - Proverbs 29:19 (KJV)
"Fodder, and a wand, and a burden are for an ass: bread, and correction, and work for a slave. He worketh under correction, and seeketh to rest: let his hands be idle, and he seeketh liberty. The yoke and the thong bend a stiff neck, and continual labours bow a slave. Torture and fetters are for a malicious slave: send him to work, that he be not idle: For idleness hath taught much evil. Set him to work: for so it is fit for him. And if he be not obedient, bring him down with fetters, but be not excessive towards any one: and do no grievous thing without judgment." - Ecclesiasticus 33:25-30 (63)
"Servants, be obedient to them that are your masters according to the flesh, with fear and trembling, in singleness of your heart, as unto Christ;" - Ephesians 6:5 (KJV)
"Servants, obey in all things your masters according to the flesh; not with eyeservice, as menpleasers; but in singleness of heart, fearing God;" - Colossians 3:22 (KJV)
"Masters, give unto your servants that which is just and equal; knowing that ye also have a Master in heaven." - Colossians 4:1 (KJV)
"Let as many servants as are under the yoke count their own masters worthy of all honour, that the name of God and his doctrine be not blasphemed. And they that have believing masters, let them not despise them, because they are brethren; but rather do them service, because they are faithful and beloved, partakers of the benefit. These things teach and exhort." - 1_Timothy 6:1-2 (KJV)
"Exhort servants to be obedient unto their own masters, and to please them well in all things; not answering again; Not purloining, but shewing all good fidelity; that they may adorn the doctrine of God our Saviour in all things." - Titus 2:9-10 (KJV)
"Servants, be subject to your masters with all fear; not only to the good and gentle, but also to the froward. For this is thankworthy, if a man for conscience toward God endure grief, suffering wrongfully. For what glory is it, if, when ye be buffeted for your faults, ye shall take it patiently? but if, when ye do well, and suffer for it, ye take it patiently, this is acceptable with God." - 1_Peter 2:18-20 (KJV)