And this is how I saw the horses in the vision, and those seated on them: they had fire-red and hyacinth-blue and sulphur-yellow breastplates; and the heads of the horses were as heads of lions, and out of their mouths fire and smoke and sulphur issued forth.

Revelation 9:16-

The locusts had teeth like those of lions; the horses of the cavalry have heads like those of lions. Both are therefore tied in with the courageous Lion of the tribe of Judah, Jesus Christ, who is their Leader, Commander, and Exemplar.​—Revelation 5:5; Proverbs 28:1.