Romans 1:32
These people know that God's decrees require that those who practice such things deserve to die [i.e., either spiritual or temporal punishment], yet they not only do the same things [themselves], but even approve of other people who practice them.
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].
Matthew 23:30
And you say, 'If [only] we had lived in the days of our forefathers, we [certainly] would not have participated with them in [shedding] the blood of the prophets.'
Ephesians 5:11-13
Do not have fellowship with [people who practice] worthless deeds of darkness [i.e., sinful living], but expose them instead.
Hebrews 13:4
Marriage should be considered honorable among all people and its sexual responsibilities should be faithfully kept. For God will judge [and condemn] those people who are sexually immoral and who are sexually unfaithful to their mates.