Adam Clarke Bible Commentary
Your fathers, where are they? - Israel has been destroyed and ruined in the bloody wars with the Assyrians; and Judah, in those with the Chaldeans.
The prophets, do they live for ever? - They also, who spoke unto your fathers, are dead; but their predictions remain; and the events, which have taken place according to those predictions, prove that God sent them.
Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary
A reason for the warning not to resist the words of the Lord, like the fathers, is given in Zac 1:5, Zac 1:6, by an allusion to the fate which they brought upon themselves through their disobedience. Zac 1:5. "Your fathers, where are they? And the prophets, can they live for ever? Zac 1:6. Nevertheless my words and my statutes, which I commanded my servants the prophets, did they not overtake your fathers, so that they turned and said, As Jehovah purposed to do to us according to our ways and our actions, so has He done to us?" The two questions in Zac 1:5 are meant as denials, and are intended to anticipate the objection which the people might have raised to the admonitions in Zac 1:4, to the effect that not only the fathers, but also the earlier prophets, had died long ago; and therefore an allusion to things that had long since passed by could have no force at all for the present generation. Zechariah neutralizes this objection by saying: Your fathers have indeed been long dead, and even the prophets do not, or cannot, live for ever; but notwithstanding this, the words of the earlier prophets were fulfilled in the case of the fathers. The words and decrees of God uttered by the prophets did reach the fathers, so that they were obliged to confess that God had really done to them what He threatened, i.e., had carried out the threatened punishment. אך, only, in the sense of a limitation of the thing stated: yet, nevertheless (cf. Ewald, 105, d). דּברי and חקּי are not the words of Zac 1:4, which call to repentance, but the threats and judicial decrees which the earlier prophets announced in case of impenitence. דּברי as in Eze 12:28; Jer 39:16. חקּי, the judicial decrees of God, like chōq in Zep 2:2. Hissı̄g, to reach, applied to the threatened punishments which pursue the sinner, like messengers sent after him, and overtake him (cf. Deu 28:15, Deu 28:45). Biblical proofs that even the fathers themselves did acknowledge that the Lord had fulfilled His threatenings in their experience, are to be found in the mournful psalms written in captivity (though not exactly in Psa 126:1-6 and Psa 137:1-9, as Koehler supposes), in Lam 2:17 (עשׂה יהוה אשׁר זמם, upon which Zechariah seems to play), and in the penitential prayers of Daniel (Dan 9:4.) and of Ezra (Ezr 9:6.), so far as they express the feeling which prevailed in the congregation.
Jamieson-Fausset-Brown Bible Commentary
Your fathers . . . and the prophets, do they live for ever?--In contrast to "My words" (Zac 1:6), which "endure for ever" (Pe1 1:25). "Your fathers have perished, as was foretold; and their fate ought to warn you. But you may say, The prophets too are dead. I grant it, but still My words do not die: though dead, their prophetical words from Me, fulfilled against your fathers, are not dead with them. Beware, then, lest ye share their fate."
John Gill Bible Commentary
Your fathers, where are they?.... They are not in the land of the living; they perished by the sword of the Chaldeans, or died in captivity:
and the prophets, do they live for ever? meaning either the false prophets, as Hananiah and Shemaiah, Jer 28:17 or the true prophets of the Lord; and the words may be considered as a prevention of an objection the people might make, taken from their prophets dying in common with their fathers; and so the Targum paraphrases them, "and if you should say, the prophets, do they live for ever?" which is followed by Jarchi, and embraced by many interpreters: the answer is, it is true they died; but then their words live, and have had their full accomplishment.