Isa 5:26-28

26He will raise a signal for a nation far away, and whistle for a people at the ends of the earth; Here they come, swiftly, speedily!27None of them is weary, none stumbles, none slumbers or sleeps, not a loincloth is loose, not a sandal-thong broken;28their arrows are sharp, all their bows bent, their horses' hoofs seem like flint, and their wheels like the whirlwind.