Revelation 9:15-18

And they let loose the four angels who had been kept ready for this hour and day and month and year so they could kill a third of all people on the earth. I heard how many troops on horses were in their army—two hundred million. The horses and their riders I saw in the vision looked like this: They had breastplates that were fiery red, dark blue, and yellow like sulfur. The heads of the horses looked like heads of lions, with fire, smoke, and sulfur coming out of their mouths. A third of all the people on earth were killed by these three terrible disasters coming out of the horses’ mouths: the fire, the smoke, and the sulfur.