ISB ~ Mark 9 v10

rising from the dead:The belief in a collective resurrection was accepted by many Jews during NT times (Dan 12:2; Jn 11:23-25; Acts 24:15). Only the Sadducees expressly denied it (12:18). The disciples are here perplexed that Jesus speaks of an individual resurrection, since they as yet had no clear understanding of a dying and rising Messiah (8:31-33).