In that day — The day of the full accomplishment of this prophecy is a day known to the Lord. A burdensome stone — Too heavy for them, though many join together to remove it.
Related Commentaries of Zechariah 12:3
Zechariah 12:3
3 And in that day will I make Jerusalem a burdensome stone for all people: all that burden themselves with it shall be cut in pieces, though all the people of the earth be gathered together against it.