The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity;
The son of man shall send forth his angels, and they shall gather out of his kingdom - to which they never really belonged. They usurped their place and name and outward privileges; but "the ungodly shall not stand in the judgment, nor sinners [abide] in the congregation of the righteous" (Psalms 1:5).
All things that offend, х panta (G3956) ta (G3588) skandala (G4625)] - all those who have proved a stumbling-block to others,
And them which do iniquity. The former class, as the worst, are mentioned first.