The Cessation of the Guild of Prophets Because They Are No Longer True (Zechariah 13:2-3).
‘And it will happen in that day,' says YHWH of Hosts, ‘that I will cut off the names of the idols out of the land, and they will not be remembered any more, and I will also cause the prophets and the unclean spirit to pass out of the land.'
The final result of the purification and cleansing will be that idolatry and false prophecy will be removed from the land forever (compare Zechariah 5:5-11). Even the memory of them will go. Truth will be victorious.
‘The unclean spirit.' The spirit who speaks through the false prophets.
Thus the inference is that once the true Servant of God has come cultic prophecy will be a thing of the past for He will reveal the full truth and those who follow Him will receive the truth from Him.
‘And it will happen that when any shall yet prophesy, then his father and his mother who begat him will say to him, “You will not live, for you speak lies in the name of YHWH.” And his father and his mother who begat him will pierce him through when he prophesies.'
Once the days of the Messiah are here there will be no room for the old cult of prophets. Any who set themselves up as such will be denounced even by their parents and they will be declared worthy of punishment.
‘And his father and his mother --- will pierce him through --'. This clearly connects with the piercing through of the True Prophet in Zechariah 12:10. There the true prophet was pierced through because He was rejected by men. But God exonerated Him and identified Himself with Him. Here it is the turn of the false prophets, who played their part in His rejection, themselves to suffer the fate of a false prophet. This suggests that at the time of Zechariah false prophecy was dealt with in this way. We do not know of what the piercing through consisted but Zechariah 13:6 suggests that it was connected with the hands.