While the Bible may cry for the mercy of that one slave, what about these cherry-picked quotes:
When a slave owner strikes a male or female slave with a rod and the slave dies immediately, the owner shall be punished. But if the slave survives a day or two, there is no punishment; for the slave is the owner’s property. (Exod. 21:20-21)
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. (Exodus 21:1-4)
And if thy brother, an Hebrew man, or an Hebrew woman, be sold unto thee, and serve thee six years; then in the seventh year thou shalt let him go free from thee.And when thou sendest him out free from thee, thou shalt not let him go away empty: Thou shalt furnish him liberally out of thy flock, and out of thy floor, and out of thy winepress: of that wherewith the LORD thy God hath blessed thee thou shalt give unto him. (Deuteronomy 15:12-18)
And if a man sell his daughter to be a maidservant, she shall not go out as the menservants do. (Exodus 21:7)
Your male and female slaves are to come from the nations around you; from them you may buy slaves. You may also buy some of the temporary residents living among you and members of their clans born in your country, and they will become your property. You can will them to your children as inherited property and can make them slaves for life, but you must not rule over your fellow Israelites ruthlessly. (Leviticus 25:44-46)
After that he is sold he may be redeemed again; one of his brethren may redeem him: Either his uncle, or his uncle’s son, may redeem him, or any that is nigh of kin unto him of his family may redeem him; or if he be able, he may redeem himself. And he shall reckon with him that bought him from the year that he was sold to him unto the year of jubilee: and the price of his sale shall be according unto the number of years, according to the time of an hired servant shall it be with him. (Leviticus 25:48-53)
Or what about Jesus’ tacit acceptance of slavery as suggested by:
Who then is the faithful and wise slave, whom his master has put in charge of his household, to give the other slaves their allowance of food at the proper time? Blessed is that slave whom his master will find at work when he arrives. (Matt. 24:45-46)
A disciple is not above the teacher, nor a slave above the master (Matt. 10:24)
And what about Paul?
Let all who are under the yoke of slavery regard their masters as worthy of all honor, so that the name of God and the teaching may not be blasphemed. Those who have believing masters must not be disrespectful to them on the ground that they are members of the church; rather they must serve them all the more, since those who benefit by their service are believers and beloved. Teach and urge these duties. Whoever teaches otherwise and does not agree with the sound words of our Lord Jesus Christ and the teaching that is in accordance with godliness, is conceited, understanding nothing, and has a morbid craving for controversy and for disputes about words. From these come envy, dissension, slander, base suspicions, and wrangling among those who are depraved in mind and bereft of the truth, imagining that godliness is a means of gain. (1Tim. 6:1-5)
Slaves, obey your earthly masters with fear and trembling, in singleness of heart, as you obey Christ; not only while being watched, and in order to please them, but as slaves of Christ, doing the will of God from the heart. (Eph. 6:5-6)
Tell slaves to be submissive to their masters and to give satisfaction in every respect; they are not to talk back, not to pilfer, but to show complete and perfect fidelity, so that in everything they may be an ornament to the doctrine of God our Savior. (Titus 2:9-10)
Slaves, accept the authority of your masters with all deference, not only those who are kind and gentle but also those who are harsh. For it is a credit to you if, being aware of God, you endure pain while suffering unjustly. If you endure when you are beaten for doing wrong, what credit is that? But if you endure when you do right and suffer for it, you have God’s approval. (1Pet. 2:18-29)
While Jesus, that crazy nice guy, never comes out in favour of slavery, he does aknowledge its existence without stopping to say, “Oh, by the way, it’d be great if people stopped owning other people.” So there is no repeal of the existing slavery laws established in the Old Testament from Jesus. On the other hand, Paul talks a fair amount about slavery and goes so far as to put it in a very positive light – strengthening the OT’s position on slavery rather than weakening it.