What does Zechariah 1:9 mean?

But my words and my decrees, which I commanded my servants the prophets, didn’t they overtake your fathers? “Then they repented and said, ‘Just as Yahweh of Armies determined to do to us, according to our ways, and according to our practices, so he has dealt with us.’”

On the twenty-fourth day of the eleventh month, which is the month Shebat, in the second year of Darius, Yahweh’s word came to Zechariah the son of Berechiah, the son of Iddo, the prophet, saying,

“I had a vision in the night, and behold, a man riding on a red horse, and he stood among the myrtle trees that were in a ravine; and behind him there were red, brown, and white horses.

The man who stood among the myrtle trees answered, “They are the ones Yahweh has sent to go back and forth through the earth.”

They reported to Yahweh’s angel who stood among the myrtle trees, and said, “We have walked back and forth through the earth, and behold, all the earth is at rest and in peace.”

Then Yahweh’s angel replied, “O Yahweh of Armies, how long will you not have mercy on Jerusalem and on the cities of Judah, against which you have had indignation these seventy years?”