Vincent's NT Word Studies
9. Tell (dihghswntai). Mark's word is more graphic than Matthew's eiphte. The word is from dia, through, and hJgeomai, to lead the way. Hence to lead one through a series of events: to narrate.Questioning. Wyc., asking. Tynd., disputing.
Robertson's NT Word Studies
9:9 {Save when} (ei me hotan). Matthew has "until" (hews hou). {Should have risen} (anastei). Second aorist active subjunctive. More exactly, "should rise" (punctiliar aorist and futuristic, not with any idea of perfect tense). #Lu 9:36 merely says that they told no man any of these things. It was a high and holy secret experience that the chosen three had had for their future good and for the good of all.