Albert Barnes Commentary Luke 9:44

"Let these words sink into your ears: for the Son of man shall be delivered up into the hands of men." — Luke 9:44 (ASV)

Let these sayings. This probably refers to the sayings of the people who had seen his miracles and, for that reason, had praised and glorified God. On that basis, they had acknowledged him to be the Christ. As if he had said, "I am about to die. You will then be disconsolate and perhaps doubtful about my being the Christ. Then remember these miracles and the confessions of the people—the evidence which I gave you that I was from God."

Alternatively, it may mean, "Remember that I am about to die, and let my sayings regarding that sink down into your hearts, for it is a most important event. You will need to remember when it takes place that I told you of it."

This last interpretation, however, does not agree with the Greek as well as the former.