Here "word" refers to what someone says. Alternate translation: "If a person says anything bad about the Son of Man" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "this world" and "that which is to come" refer to the present life and the next life. Alternate translation: "in this life or in the next life" or "now or ever" (See: [[rc://en/ta/man/translate/figs-metonymy]])