Matthew 16:21

From that time began [α π ο τ ο τ ε η ρ ξ α τ ο]. He had not shown it to them before.

Must [δ ε ι]. It was necessary in fulfilment of the divine purpose. See Matthew 26:54; Hebrews 8:3; Luke 24:26.

Suffer. This first announcement mentions this passion and death generally; the second (xvii. 22, 23), adds his betrayal into the hands of sinners; the third (xx. 17 - 19), at length expresses his stripes, cross, etc. Elders and chief priests and scribes. A circumstantial way of designating the Sanhedrim, or supreme council of the Jewish nation.