2 Red horses were in the first chariot; and in the second chariot black horses;
Zechariah 6:2 Cross References - MKJV
Zechariah 1:8
8 I watched by night. And behold! a Man riding on a red horse, and He stood among the myrtle trees in the ravine. And behind Him were red, sorrel and white horses.
Zechariah 6:6
6 The black horses in it go forth into the north country; and the white go forth after them; and the dappled go forth to a south country.
Revelation 6:2-6
2 And I saw. And behold a white horse! And he sitting on it had a bow. And a crown was given to him, and he went forth conquering and to conquer.
3 And when He had opened the second seal, I heard the second living creature say, Come and see.
4 And another, a red horse, went out. And power was given to him sitting on it, to take peace from the earth, and that they should kill one another. And there was given to him a great sword.
5 And when He had opened the third seal, I heard the third living creature say, Come and see. And I looked, and lo, a black horse. And he sitting on it had a balance in his hand.
6 And I heard a voice in the midst of the four living creatures say, A choenix of wheat for a denarius, and three choenixes of barley for a denarius. And do not hurt the oil and the wine.
Revelation 12:3
3 And another sign was seen in the heavens. And behold a great red dragon, having seven heads and ten horns and seven crowns on his heads!
Revelation 17:3
3 And he carried me away into a desert by the Spirit. And I saw a woman sitting on a scarlet-colored beast, filled with names of blasphemy, having seven heads and ten horns.