Jesus had no idea that he came to die for the sins of the world (Mathew 9:13) and made this clear through an illustration so that no one can get a different meaning. (Mathew 21:37)
The spurious reference to his death as a sacrifice for sin-atonement found in Mathew 20:25-28 is deleted from Luke's careful wordings:
And he said to them, “The kings of the Gentiles exercise lordship over them, and those in authority over them are called benefactors. But not so with you. Rather, let the greatest among you become as the youngest, and the leader as one who serves. For who is the greater, one who reclines at table or one who serves? Is it not the one who reclines at table? But I am among you as the one who serves. "(Luke 22:25-27)