Matthew 17:22,23

See also Mark 9:30; Luke 9:43.

And while they abode in Galilee - Galilee, the northern part of Palestine. See the notes at Matthew 2:22.

The Son of man shall be betrayed ... - To betray means to deliver up in a treacherous manner. This was done by Judas Iscariot, called for that act the traitor, Matthew 26:14, Matthew 26:47. A traitor, or betrayer, is one who makes use of confidence reposed in him for the purpose of delivering him up who puts that confidence in him to the hands of enemies.

Matthew 17:23

And they shall kill him, and the third day he shall be raised again - See Matthew 12:40. Mark and Luke add that they understood not that saying, and it was hid from them, and they were afraid to ask him. The reasons of this may have been,

1. They were strongly attached to him, and were exceedingly sorry (Matthew) at any intimation that he was soon to leave them. They learned with great slowness and reluctance, therefore, that he was to be treated in this manner.
2. They were not willing to believe it. They knew that he was the Messiah, but they supposed that he was to be a distinguished prince, and was to restore the kingdom to Israel, Acts 1:6. But to be betrayed into the hands of his enemies, and be put to death, appeared to them to be frustrating all these expectations.
3. Though what he said was plain enough, yet they did not understand it; they could not see how he could be the Messiah, and yet be put to death in this manner; nor did they understand it fully until after the resurrection.