Zechariah 11:6

He then adds, And he who fed then has not spared them. The meaning is, that the people, according to the opinions commonly entertained, were not worthy of mercy and kindness. Hence, as I have said, the wonderful goodness of God shines forth more clearly; for he condescended to take the care of a flock that was wholly despised. (134) Then he says, I will not spare the inhabitants of the land; behold I will deliver, etc. To some it appears that there is here a reason given; for the Jews would have never been thus stripped, had not God been angry with them; as though he had said, that God’s vengeance was just, inasmuch as they were thus exposed to such atrocious wrongs. But according to my judgment God simply confirms what we have stated, — that his future vengeance on the Jews would be most just, because he had in feeding them so carefully labored wholly in vain. For though the Prophet has not as yet expressed what we shall hereafter see respecting their ingratitude, he yet does not break off his discourse without reason, for indignation has ever some warmth in it; he then in the middle of his argument exclaims here, I will not spare; for God had spared the Jews, when yet all men exercised cruelty towards them with impunity; and when they were contemptible in the sight of all, he still had regarded their safety. As then they had been so ungrateful for so many acts of kindness, ought not God to have been angry with them? This is then the reason why the Prophet introduces here in God’s name this threatening, Surely I will not spare them; that is, “I have hitherto deferred my vengeance, and have surpassed all men in kindness and mercy; but I have misplaced my goodness, and now there is no reason why I should longer suspend my judgment.” I will spare then no longer the inhabitants of this land

I will give, or deliver, he says, every man into the hand of his friend; as though he had said, “They are no longer sheep, for they will not bear to be ruled by my hand, though they have found me to be the best of shepherds. They shall now tear and devour one another; and thus a horrible dispersion will follow.” Now the Jews ought to have dreaded nothing so much, as to be given up to destroy themselves by mutual slaughter, and thus to rage cruelly against one another and to perish without any external enemy: but yet God declares that this would be the case, and for this reason, because he could not succeed with them, though willing to feed them as his sheep and ready to perform the office of shepherd in ruling them. (135)

He concludes by saying, They shall smite the land, and I will not deliver from their hand. He intimates in the last place that ruin without any remedy was nigh; for he alone was the only deliverer of the people; but now he testifies that their safety would not be the object of his care; for should he see them perishing a hundred times, he would not be moved with pity, nor turn to bring them help, inasmuch as they had precluded all compassion. It now follows —