When we see some Christian brother or sister that is caught in a sin, we should pray for that person. While we are praying for that person, we should also ask the Holy Spirit to give us the words we need to say to them. We need to ask God to give them a receptive spirit to the words and speak those words in love and offer to help them, if we can. Be sure we are not belittling or harsh in our comments. At the same time, we must be sincere and not back down if we personally know that we are speaking the truth and it is not just hearsay. Correcting our brothers and sisters just might be the hardest thing we are ever asked to do. Why? Because we are not perfect and never will be. We will have to risk rejection and possibly a bad reaction from them. If they respond badly, you may be tempted to react to their actions. Don’t!
Do not gossip (or as we Christians love to say, “share”) about the incident or the person. The next thing is to take other witnesses with you.
15 “If your brother or sister sins, go and point out their fault, just between the two of you. If they listen to you, you have won them over. 16 But if they will not listen, take one or two others along, so that ‘every matter may be established by the testimony of two or three witnesses.’ 17 If they still refuse to listen, tell it to the church; and if they refuse to listen even to the church, treat them as you would a pagan or a tax collector.–Matt. 18:15-17 (NIV)