Charles Spurgeon Commentary Zechariah 11:16-17

"For, lo, I will raise up a shepherd in the land, who will not visit those that are cut off, neither will seek those that are scattered, nor heal that which is broken, nor feed that which is sound; but he will eat the flesh of the fat [sheep], and will tear their hoofs in pieces. Woe to the worthless shepherd that leaveth the flock! the sword shall be upon his arm, and upon his right eye: his arm shall be clean dried up, and his right eye shall be utterly darkened." — Zechariah 11:16-17 (ASV)

These were the shepherds to whom Israel was left when they rejected Christ. They did nothing for the people; they were a curse to them, and they themselves were blinded; their own power failed.

Well now, what actually took place with regard to Israel also takes place with regard to any church that casts off Christ and his teaching: it becomes an anti-Christ. And all this has surely been fulfilled in the great anti-Christian system, which is not yet dead, and which destroys and injures. To this day, its arm is completely dried up, and its right eye is utterly dimmed.

We have a terrible description of what God will do to these who turn away from him.