“The Son of Man will send out his angels.” Matthew 13:41-43 describes what happens after the Battle of Armageddon: Jesus sends out his angels and gathers the people of the earth who have survived the Great Tribulation and the Battle of Armageddon and separates them into two groups: the godly (“sheep”) and the ungodly (“goats”). Then he judges them and the sheep are allowed to enter his kingdom while the goats are thrown into the Lake of Fire. This judgment is described in more detail in Matthew 25:31-46.
[For more on the Sheep and Goat Judgment, see commentary on Matt. 25:31; 25:32; and 25:33. For more about Jesus’ future kingdom on earth, see Appendix 3, “Christ’s Future Kingdom on Earth”].
“those who are guilty of lawlessness.” The Greek text is more literally, those who “are doing lawlessness,” but that does not read well in English. Some versions have “those who practice lawlessness,” but that does not read well in English either. The phrase, “those who are guilty of lawlessness” catches the sense well (cp. CSB).