...the apostolic kerygma seems succinctly articulated in Hebrews 9:27–28: 

“And just as it is appointed for man to die once, and after that comes judgment, so Christ, having been offered once to bear the sins of many, will appear a second time, not to deal with sin but to save those who are eagerly waiting for him.” 

Just as there is a twofold apocalyptic “appointment” (Gk. apokeimai) for sinful humanity (death and judgment), so also is there a corresponding twofold apocalyptic “appointment” for the righteous Messiah (sacrifice and salvation). Both assume the basic two-age framework which revolves around the eschatological “Day” (10:25). -John P. Harrigan