(Zec 14:4, Zec 14:6-9, Zec 14:13). Jerome states it was a custom in Palestine to test the strength of youths by their lifting up a massive stone; the phrase, “burden themselves with it,” refers to this custom. Compare Mat 21:44 : The Jews “fell” on the rock of offense, Messiah, and were “broken”; but the rock shall fall on Antichrist, who “burdens himself with it” by his assault on the restored Jews, and “grind him to powder.”
all ... people of ... earth - The Antichristian confederacy against the Jews shall be almost universal.