Jamieson, Fausset and Brown on Amos 6:11

11. commandeth, and he will smite--His word of command, when once given, cannot but be fulfilled (Is 55:11). His mere word is enough to smite with destruction.

great house ... little house--He will spare none, great or small (Am 3:15). Jerome interprets "the great house" as Israel, and "the small house" as Judah: the former being reduced to branches or ruins, literally, "small drops"; the latter, though injured with "clefts" or rents, which threaten its fall, yet still permitted to stand.