"Woe" (Heb. hoy) introduces a judgment oracle. Assyria was like a rod in God"s hand; He controlled her actions. He would send her to discipline godless Judah, against whom God"s fury burned: "to capture booty and to seize plunder" ( Isaiah 10:6, the meaning of Maher-shalal-hash-baz"s name, Isaiah 8:1; Isaiah 8:3). However, Assyria was in for woe herself (cf. Isaiah 10:1) because she failed to acknowledge that she was under the sovereign authority of Yahweh. [source][source][source]