Thematic Bible: Who not to partake with

For you may be absolutely sure that no one who is sexually impure, immoral or greedy for gain (for that is idolatry) can have a part in the kingdom of Christ and God. Stop letting anyone deceive you with groundless arguments about these things, for it is because of these very sins that God's anger comes down upon the disobedient. So you must stop having anything to do with them.

After this I saw another angel coming down from heaven. He had great authority and the earth was lighted up with his splendor. He shouted with a mighty voice: "She has fallen! Mighty Babylon has fallen! She has become a den for demons, a dungeon for every foul spirit and every unclean and loathsome bird, because all the nations have fallen by drinking the raging wine of her immorality; the kings of the earth have joined her in her immorality, and the businessmen of the earth have grown rich from the wealth of her luxury." read more.
Then I heard another voice from heaven say: "Come out of her, my people, so that you may not share in her sins and suffer from her plagues. For her sins are piled clear up to heaven, and God has remembered the wrongs which she has done.