So even such can be spiritually dangerous for the Christian. No sin is insignificant and completely harmless. For Christ, our Passover lamb, has been sacrificed. It was their responsibility to change and get the boasting out of their lives. Therefore let us keep the Festival, not with the old yeast, the yeast of malice and wickedness, but with bread without yeast, the bread of sincerity and truth.
Christians are to be that bread of sincerity and truth .
But among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God's holy people . Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving. Since the statement not to associate with sexually immoral people is not found in this epistle, we can only assume that Paul wrote them at least one other time before this epistle, where that is stated. This means there are lost writings from people who wrote inspired Scripture. In that case you would have to leave this world.