Judge not, and you will not be judged. (Luke 6, 37)
And Jesus said to his disciples: Be merciful, even as your Father is merciful. “Judge not, and you will not be judged; condemn not, and you will not be condemned; forgive, and you will be forgiven; give, and it will be given to you. Good measure, pressed down, shaken together, running over, will be put into your lap. For with the measure you use it will be measured back to you.” (Luke 6: 36-38)
Jesus commands use not to judge others. This commandment is about the sinner, not the sin. We must judge bad behavior, both so as not to be accomplices to it and to correct or avoid those who commit it. In pagan society, as we have today, generally people are lax about moral principles while they are absolutely uncompromising, harsh, and condemning of wrongdoers. Let us, as Christians, try not to fall into this trap.