Zechariah 8:9

8:9 “The Lord who rules over all also says, ‘Gather strength, you who are listening to these words today from the mouths of the prophets who were there at the founding of the house of the Lord who rules over all, ¹  so that the temple might be built.

Zechariah 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. ² 

[8:9]  ¹ sn These prophets who were there at the founding of the house of the Lord who rules over all included at least Haggai and Zechariah, and perhaps others. The founding referred to here is not the initial laying of the temple’s foundations in 536 b.c. (Ezra 3:8) but the resumption of work two years before the time of the present narrative (i.e., in 520 b.c.), as vv. 10-12 make clear.

[13:3]  ² 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).