1 Timothy 5:22
Do not be in a hurry to lay hands on anyone [i.e., to appoint them to office. See 4:14], and do not participate in the sins of other people. [Note: If Timothy failed to carefully determine the qualifications of a prospective elder before appointing him, it would make him partially responsible for any wrongdoing by that elder]. Keep yourself pure [i.e., of involvement in anyone's sins].
Revelation 16:19
And the great city was split into three parts, and the cities of the nations were destroyed. And God remembered the great Babylon and made her drink from the cup of wine of His fierce anger.
Revelation 18:4-6
Then I heard another voice from heaven, saying, "Come out of her, my people, so that you do not share in her sins, and so that you do not receive her plagues [i.e., judgments].