Charles Ellicott Commentary Zechariah 12:3

"And it shall come to pass in that day, that I will make Jerusalem a burdensome stone for all the peoples; all that burden themselves with it shall be sore wounded; and all the nations of the earth shall be gathered together against it." — Zechariah 12:3 (ASV)

A burdensome stone: In lifting it, the builders might lacerate themselves. This means that those who would endeavor to build Jerusalem into the fabric of their own dominion would injure themselves in the attempt.

But some (as Jerome) suppose the figure is borrowed from some kind of athletic sport, such as “lifting the weight”; while others interpret the expression more generally, referring merely to a weight that is too heavy to be borne.