The Lord has sent a message against Jacob, and it has fallen upon Israel.
PROPHECY AS TO THE TEN TRIBES. (Isa. 9:8-10:4) Heading of the prophecy; (Isa 9:8-12), the first strophe. unto Jacob--against the ten tribes [LOWTH]. lighted upon--fallen from heaven by divine revelation (Dan 4:31).
Commenting on Isaiah 9:8-12
8. The Lord hath sent a word. Here he relates a new prediction, for I think that this discourse is separated from the former, because the Prophet now returns to speak of the future condition of the kingdom of Israel, which was at that time hostile to the Jews.
The Lord sent a word into Jacob, and it hath lighted upon Israel. (m) This is another prophecy against them of Samaria who were mockers and contemners of God's promises and menaces.