John Calvin Reformed @genevareformer

9. And the people shall know. By the word people I understand, not the Jews, but rather the Israelites; and, indeed, the Prophet removes doubt by expressly naming Ephraim. He likewise adds Samaria, which was the metropolis of that people, or of the ten tribes; for fortified cities, conceiving themselves to be placed beyond the reach of danger, are much more insolent in their pretensions.

Matthew Henry Presbyterian @wholebiblehenry

Here are terrible threatenings, which are directed primarily against Israel, the kingdom of the ten tribes, Ephraim and Samaria, the ruin of which is here foretold, with all the woeful confusions that were the prefaces to that ruin, all which came to pass within a few years after; but they look further, to all the enemies of the throne and kingdom of Christ the Son...

Commenting on Isaiah 9:8-21

John Gill Reformed Baptist @doctorgill

And all the people shall know,.... The word of the Lord, and that it is his; and by sad experience shall feel the weight of it; or, "the people shall know the whole of it" (y); shall find that the whole of it will be accomplished, every punctilio in it; whatever is said is done, everything predicted by it, the substance of it, and every...