Matthew
Matthew 16:21ESV·traditional attribution

From that time Jesus began to show his disciples that he must go to Jerusalem and suffer many things from the elders and chief priests and scribes, and be killed, and on the third day be raised.

Matthew Henry Presbyterian @wholebiblehenry

We have here Christ's discourse with his disciples concerning his own sufferings; in which observe, I. Christ's foretelling of his sufferings. Now he began to do it, and from this time he frequently spake of them. Some hints he had already given of his sufferings, as when he said, Destroy this temple: when he spake of the Son of man being lifted up, and of...

Commenting on Matthew 16:21-23

John Gill Reformed Baptist @doctorgill

Then Peter took him,.... The Arabic version reads it, "called to him": the Ethiopic, "answered him"; and the Syriac, "led him"; he took him aside, by himself; and as the Persic version, "privately said to him", or he took him by the hand in a familiar way, to expostulate with him, and dissuade him from thinking and talking of any such things; and began to...

Albert Barnes Presbyterian @notesbybarnes

Verses 21-23. See also . From that time forth. This was the first intimation that he gave that he was to die in this cruel manner. He had taken much pains to convince them that he was the Messiah; he saw by the confession of Peter that they were convinced; and he then began to prepare theft minds for the awful event which was before him.