Revelation 22:15

For without are dogs and sorcerers... — Better, Outside are the dogs, and the sorcerers, and the fornicators, and the murderers, and the idolators, and every one loving and doing falsehood. The language is again an echo of earlier words. (See Revelation 21:8.) The allusion to the dogs outside the city is hardly appreciated by Westerns. In the East, however, “troops of hungry and semi-wild dogs used to wander about the fields and streets of the cities, devouring dead bodies and other offal (1 Kings 14:11; 1 Kings 16:4; 1 Kings 21:19; 1 Kings 22:38; 2 Kings 9:10; 2 Kings 9:36; Jeremiah 15:3; Psalms 59:6), and thus became such objects of dislike that fierce and cruel enemies are poetically styled dogs in Psalms 22:16; Psalms 22:20.” The dog, moreover, was an unclean animal; dogs, therefore, are represented as outside the city, because nothing unclean is allowed to enter. The sins enumerated here are similar to those mentioned in the last chapter (Revelation 22:8); it is the reiteration, therefore, of the warning that those who would enter in must break off their sins by righteousness.