Isaiah 18:3

All ye inhabitants of the world and dwellers on the earth, see ye, always on the lookout for important happenings, when he lifteth up an ensign on the mountains, really, with an impersonal subject, when one does this, when this happens; and when he bloweth a trumpet, hear ye. The signals for the combat having been given, all the people concerned should be watching, for something of great moment will happen.