Zechariah 1:8-10

8I saw by night, and behold, a man riding upon a red horse, and he stood among the myrtle-trees that were in the low valley; and behind him were red, bay, and white horses.

9And I said, My lord, what are these? And the angel that talked with me said unto me, I will shew thee what these are.

10And the man that stood among the myrtle-trees answered and said, These are they whom Jehovah hath sent to walk to and fro through the earth.