Read Luther’s Small Catechism—The Eighth Commandment:
You shall not bear false witness against your neighbor.
What is this? or What does this mean?
We are to fear and love God, so that we do not tell lies about our neighbors, betray or slander them, or destroy their reputations. Instead we are to come to their defense, speak well of them, and interpret everything they do in the best possible light.
Now Read Matthew 18:15-20:
15 “If another member of the church[d] sins against you,[e] go and point out the fault when the two of you are alone. If the member listens to you, you have regained that one.[f] 16 But if you are not listened to, take one or two others along with you, so that every word may be confirmed by the evidence of two or three witnesses. 17 If the member refuses to listen to them, tell it to the church; and if the offender refuses to listen even to the church, let such a one be to you as a Gentile and a tax collector. 18 Truly I tell you, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven. 19 Again, truly I tell you, if two of you agree on earth about anything you ask, it will be done for you by my Father in heaven. 20 For where two or three are gathered in my name, I am there among them.”
Now watch this clip from the movie Doubt:
Now read Matthew 12:22-32:
22 Then they brought to him a demoniac who was blind and mute; and he cured him, so that the one who had been mute could speak and see. 23 All the crowds were amazed and said, “Can this be the Son of David?” 24 But when the Pharisees heard it, they said, “It is only by Beelzebul, the ruler of the demons, that this fellow casts out the demons.” 25 He knew what they were thinking and said to them, “Every kingdom divided against itself is laid waste, and no city or house divided against itself will stand. 26 If Satan casts out Satan, he is divided against himself; how then will his kingdom stand? 27 If I cast out demons by Beelzebul, by whom do your own exorcists cast them out? Therefore they will be your judges. 28 But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come to you. 29 Or how can one enter a strong man’s house and plunder his property, without first tying up the strong man? Then indeed the house can be plundered. 30 Whoever is not with me is against me, and whoever does not gather with me scatters. 31 Therefore I tell you, people will be forgiven for every sin and blasphemy, but blasphemy against the Spirit will not be forgiven. 32 Whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.