Zec 12:3 | JFB | STEP | 3. ( , , ). 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 : 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.

‏ Zechariah 12:3

3. (Zec 14:4, 6-9, 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 Mt 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.