Rashi on Isaiah
that the Lord shall gather יַחְבֹּט, lit., shall beat. Jonathan renders: shall fall dead. I.e., the nations from the banks of the Euphrates to the stream of Egypt. I say, however, that these two expressions, (viz.) beating and gathering, coincide with one another, like one who bears his olive trees and goes back and gathers them and (ms. or) others gather them from the ground, so will the Holy One, blessed be He, commence the gathering, as it is said: A great shofar shall be sounded.
Rashi on Isaiah
from the flood of the river These are those lost in the land of Assyria.