"If anyone comes to you and does not bring this teaching, do not take him into your house or welcome him. Anyone who welcomes him shares in his wicked work." -- 2 John 10-11

In the legal community there is conduct called "Accessory" that is considered criminal. By definition an Accessory is "a person who assists in the commission of a crime, but who does not actually participate in the commission of the crime as a joint principal". Guilt follows the action with criminal charges and legal ramifications. Basically, anyone who is an Accessory shares in the evil work.

When it comes to spiritual matters we often lose our clarity of thought. John saw the need to give instruction on this point, as unwarranted tolerance seemed to run rampant. Time has not remedied the matter, since tolerance is the way to go for many contemporary believers. While social crime is a serious matter, spiritual heresy endangers the eternal future of the soul. John made it clear with the words, "Anyone who welcomes him shares in his wicked work."

Know what you believe my friend, and stand firm in your faith. Take notice of those who have perverted the doctrines of the faith and do not condone or encourage them. You will notice that this teaching comes in the same letter that speaks about loving the brothers. The command to love one another is well established, but do not welcome those who would lead others astray from the truth or you will share in their wicked work as an Accessory.