"Proclaim liberty throughout the land to all its inhabitants." 
Leviticus 25:10

"The Spirit of the Lord is on me,
    because he has anointed me
    to preach good news to the poor.
He has sent me to proclaim freedom for the prisoners
    and recovery of sight for the blind,
To release the oppressed,
    to proclaim the year of the Lord's favor."
Luke 4:18-19

"You, my brothers, were called to be free.  But do not use 
your freedom to indulge the sinful nature; rather, serve one 
another in love."
Galatians 5:13

"For the Lord your God is God of Gods and Lord of lords, 
the great, mighty and awesome, who shows no partiality 
and accepts no bribes.  He defends the cause of fatherless 
and the widow, and loves the alien, giving him food and 
clothing.  And you are to love those who are aliens, for you 
yourselves were aliens in Egypt."
Deuteronomy 10:17-19

"Then the King will say to those on his right, 'Come, you 
who are blessed by my Father, take your inheritance, the 
kingdom prepared for you since the creation of the world.  
For ... I was in prison and you came to visit me.  Then the 
righteous will answer him, 'Lord, ... when did we see you 
... in prison and go to visit you?'  The King will reply, 'I tell 
you the truth, whatever you did for one of the least of 
these brothers of mine, you did to me.'"
Matthew 25:34-40

"Remember those in prison as if you were their fellow 
prisoners, those who are mistreated as if you yourselves 
were suffering."
Hebrews 13:3