"Do Not Judge?" The Most Misquoted Words of the Bible

"Do not judge," the most often used scapegoat of people who know they are doing something wrong. You call them out for behaving poorly or living in habitual sin and they "remind" you that, as a Christian, you are not supposed to judge them. But is that what Jesus really meant in the seventh chapter of Matthew? Is making judgments completely forbidden for Christians or is there precedent for it?