The word of Jehovah (YHWH) came to Zechariah the son of Berechiah, the son of Iddo, the prophet. It was in the eighth month, in the second year of Darius the king:

In the second year that Darius was king, on the twenty-fourth day of the eleventh month (the month of Shebat), Jehovah gave me a message in a vision at night.

You are responsible for all the righteous blood shed on earth. That includes the blood of the righteous Abel to the blood of Zechariah, whom you killed between the sanctuary and the altar.