Jesus prophesied his death

And they were in the way going up to Jerusalem; and Jesus went before them: and they were amazed; and as they followed, they were afraid. And he took again the twelve, and began to tell them what things should happen unto him,  Saying, Behold, we go up to Jerusalem; and the Son of man shall be delivered unto the chief priests, and unto the scribes; and they shall condemn him to death, and shall deliver him to the Gentiles:   And they shall mock him, and shall scourge him, and shall spit upon him, and shall kill him: and the third day he shall rise again.
Mark 10:32-34

Jesus was talking about his death and resurrection. It was not easy for the disciples to understand. They thought of what would become of them. Two came to lobby Jesus for position of authority  and this got the others angry.

Without the resurrection our faith is vain. Death is not the end of life because there is resurrection of the dead.