Jamieson, Fausset and Brown on Ezekiel 3:18

18. warning ... speakest to warn--The repetition implies that it is not enough to warn once in passing, but that the warning is to be inculcated continually (2Ti 4:2, "in season, out of season"; Ac 20:31, "night and day with tears").

save--Eze 2:5 had seemingly taken away all hope of salvation; but the reference there was to the mass of the people whose case was hopeless; a few individuals, however, were reclaimable.

die in ... iniquity--(Joh 8:21, 24). Men are not to flatter themselves that their ignorance, owing to the negligence of their teachers, will save them (Ro 2:12, "As many as have sinned without law, shall also perish without law").