Zakharia 1:4

1:4 “Do not be like your ancestors, to whom the former prophets called out, saying, ‘The Lord who rules over all says, “Turn now from your evil wickedness,”’ but they would by no means obey me,” says the Lord.

Zakharia 13:3

13:3 Then, if anyone prophesies in spite of this, his father and mother to whom he was born will say to him, ‘You cannot live, for you lie in the name of the Lord.’ Then his father and mother to whom he was born will run him through with a sword when he prophesies. ¹ 

[13:3]  ¹ sn Death (in this case being run…through with a sword) was the penalty required in the OT for prophesying falsely (Deut 13:6-11; 18:20-22).