Ev
Matthew 5:39-42
38"You have heard that the law of Moses says, `If an eye is injured, injure the eye of the person who did it. If a tooth gets knocked out, knock out the tooth of the person who did it.' 39But I say, don't resist an evil person! If you are slapped on the right cheek, turn the other, too. 40If you are ordered to court and your shirt is taken from you, give your coat, too. 41If a soldier demands that you carry his gear for a mile, carry it two miles. 42Give to those who ask, and don't turn away from those who want to borrow.
What this passage means, is that we as Christians have to be in any and all fights for the Truth of the gospel for the long haul. If someone "slaps our cheek" we are not to simply turn away, we are to stay and not give up, but "turning the other cheek". By no means does it mean, that we Christians are to let ourselves be abused.