Matthew 18:17

And if he refuses to listen to them [i.e., the witnesses], explain the [whole] matter to the church [i.e., probably a specially called meeting of mature Christians to resolve the matter]. And if he refuses to listen to the church also, [i.e., to acknowledge his sin and repent of it], consider him like an [unconverted] Gentile or tax collector [i.e., do not have fellowship with him].

1 Corinthians 5:5-6

to turn such a person over to Satan for his body to be destroyed [Note: This probably refers to his removal from their fellowship. See verse 2], in order for his spirit to be saved in the day of the Lord [i.e., the judgment day]. [Note: This implies that his removal from their fellowship will have produced a genuine repentance before that time].

1 Corinthians 5:13

For what business is it of mine to judge outsiders? [i.e., non-Christians]; God judges them. But should you not judge those people who are inside? [i.e., Christians]. [So], remove the evil person from your fellowship [See Deut. 17:7].

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