Isaiah 7:19-20

19These [armies, like flies and bees] will all come and settle on the steep and rugged ravines and in the clefts of the rocks, and on all the thorn bushes and in all the watering places.

20In that day [when foreign armies swarm the land] the Lord will shave with a razor, hired from the regions beyond the Euphrates (that is, with the king of Assyria), [that razor will shave] the head and the hair of the legs; and it will also remove the beard [leaving Judah stripped, shamed and scorned].