John Gill Commentary Luke 18:31

"And he took unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all the things that are written through the prophets shall be accomplished unto the Son of man." — Luke 18:31 (ASV)

Then he took unto him the twelve
His twelve disciples, as the Ethiopic version expresses it; he took them aside from the rest of the company, as they were travelling on the road, and privately delivered to them, what follows; see (Matthew 20:17)

and said unto them, behold, we go up to Jerusalem ;
to the feast of the passover, which was drawing near, and the last Christ was to eat with his disciples, the time of his sufferings, and death, being now at hand; and of which he thought fit to give his disciples notice: and therefore he called them aside, and in a private manner, told them,

that all things that are written by the prophets, concerning the
son of man, shall be accomplished ;
particularly, (Psalms 2:1Psalms 2:2) (Psalms 22:6–8) (Isaiah 1:6) (Micah 5:1) (Isaiah 53:5Isaiah 53:6Isaiah 53:12) (Psalms 22:15) (26:10) (Hosea 6:2) for to these the following things have respect.