The New Covenant Begins The Condemnation of Slavery:
So far, we have shown that at one point God did allow slavery for Isreal. However, we also see God tries to protect these slaves in the same by adding many restrictions to the laws. In the Old Testament, the people of Isreal have hard hearts and if God had entirely prohibited slavery, it seems a total rejection of God would be inevitable. God may not have agreed with the act, but to create a covenant with man God had to make such sacrifices. In the New Testament, God continues his restrictions on slavery. As we see in Timothy, "Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers, 10 For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine," (1 Timothy 1:9-10 KJV).
The Greek word used for "menstealers" was "ἀνδραποδισταῖς" which more literally means enslavers. The Bible is literally claiming that those who enslave people are contrary to sound doctrine. This is the start of the banning of slavery.
We also see in Peter, "18 Servants, be subject to your masters with all fear; not only to the good and gentle, but also to the froward. 19 For this is thankworthy, if a man for conscience toward God endure grief, suffering wrongfully. 20 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. 21 For even hereunto were ye called: because Christ also suffered for us, leaving us an example, that ye should follow his steps," (1 Peter 2:18-21 KJV). Specifically, in verse 19, Peter claims slavery is "suffering wrongfully" which shows a feeling of distaste for the act.