For the time, maybe. But the few times slavery is mentioned in the NT the focus is on treatment of slaves, not abolition. And even then, for slave owners who didn't follow Christian teachings, slaves were basically told to suck it up and get back to work (1Peter 2:18). Paul appears to free Onesimus in the book of Philemon (although I can't tell if his intended meaning is literal), and it's also worth noting that Christian nations were the first to abolish chattel slavery, but it'd be a stretch to say the Bible directly discourages slavery.