Leviticus 24:1-25:55

A great discussion in this morning's group gathering centered in the necessity of atonement for sin, the many times that instructions for atoning sacrifices were repeated to the Israeli people (Genesis, Exodus, and Leviticus), the detailed requirements for those atoning sacrifices, and the awesomeness of Jesus Christ's atoning sacrifice on behalf of humanity.

I am having a hard time with Leviticus 25:44-46. "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." 

I trust the institution of slavery has been abolished by Jesus' teachings, such as:

• "Then you will know the truth, and the truth will set you free." (John 8:31)
• "Do to others as you would have them do to you." (Luke 6:31)
• "So if the Son sets you free, you will be free indeed." (John 8:36)
• And others...

Are any other institutions inherent in the first part of the Bible abolished by Jesus' teachings in another part of the Bible? If so, then what are they? If not, then why not?