Zechariah 1:8-10

8In the night I saw [a vision] and behold, a Man was riding on a red horse, and it stood among the myrtle trees that were in the ravine; and behind Him were horses: red, sorrel (reddish-brown), and white.

9Then I said, “O my lord, what are these?” And the angel who was speaking with me said, “I will show you what these are.”

10And the Man who stood among the myrtle trees answered and said, “These are the ones whom the Lord has sent to go throughout the earth and patrol it.”