Jamieson, Fausset and Brown on Zechariah 1:5

5. Your fathers ... and the prophets, do they live for ever?--In contrast to "My words" (Zec 1:6), which "endure for ever" (1Pe 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."