1 Corinthians 5:9-13
I wrote you in my letter not to associate with immoral people; I did not at all mean with the immoral people of this world, or with the covetous and swindlers, or with idolaters, for then you would have to go out of the world. But actually, I wrote to you not to associate with any so-called brother if he is an immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler—not even to eat with such a one. For what have I to do with judging outsiders? Do you not judge those who are within the church? But those who are outside, God judges. Remove the wicked man from among yourselves.

John 17:16, 18
…they are not of the world, even as I am not of the world…as you sent Me into the world, I also have sent them into the world.

First, address sexual sin within the church.
But, actually, I wrote to you not to associate with any so-called brother if he is an immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler – not to even eat with such a one. v. 11

We should mourn, not boast.

“Sometimes the most loving thing to do is speak the truth in love and the most unloving thing to do is to say nothing!”

We should confront, not condone.

We should speak up, not remain silent.

The church cannot change the world if the church is like the world.
—Warren Weirsbe

Second, stay in conversation with the world.
I wrote you in my letter not to associate with immoral people; I did not at all mean with the immoral people of this world…for then, you would have to go out of the world. v. 9-10

Unbelievers in the world WITHOUT God are in a different position than believers in rebellion AGAINST God.

Matthew 9:10-13
Then it happened that as Jesus was reclining at the table in the house, behold, many tax collectors and sinners came and were dining with Jesus and His disciples. When the Pharisees saw this, they said to His disciples, “Why is your Teacher eating with the tax collectors and sinners?” But when Jesus heard this, He said, “It is not those who are healthy who need a physician, but those who are sick. But go and learn what this means: ‘I desire compassion, and not sacrifice,’ for I did not come to call the righteous, but sinners.”

Third, God’s judgment is coming and only the Gospel can save.
For what have I to do with judging outsiders? But those who are outside, God judges. v. 13

Romans 1:24
Therefore God gave them over in the lusts of their hearts to impurity, so that their bodies would be dishonored among them.

Revelation 20:11
And I saw a great white throne and Him who sat upon it, from whose presence earth and heaven fled away, and no place was found for them.

Revelation 20:15
And if anyone’s name was not found written in the book of life, he was thrown into the lake of fire.

We are all under the condemnation and separation of sin in general.

Moral sin does not make one more lost or separate than other sin.

Our salvation is not due to our morality, but our saving belief in Jesus.