Albert Barnes Commentary Isaiah 8:10

"Take counsel together, and it shall be brought to nought; speak the word, and it shall not stand: for God is with us." — Isaiah 8:10 (ASV)

Take counsel together — This is an address to the same foreign nations. It refers to the designs which they would form to destroy the Jewish state.

Speak the word — That is, give the command — to overturn the nation of the Jews.

It shall not stand — It shall not be accomplished.

For God is with us — Hebrew, ‘For Immanuel.’ It indicates the confidence of the prophet in view of the promise and the pledge. His reliance was there. Though the enemies were strong and mighty; though the confederacy was formidable; yet his simple reliance was in the name Immanuel! In this he had confidence, despite all the violent efforts and designs of Judah’s enemies; see Numbers 14:9:

Only, rebel not ye against the Lord:
Neither fear ye the people of the land;
For they are bread for us;
Their defense has departed from them,
And Jehovah is with us,
Fear them not. (Numbers 14:9)

See also Psalms 46:6-7:

The heathen raged,
The kingdoms were moved.
He uttered his voice, the earth dissolved.
Jehovah of hosts is with us;
The God of Jacob is our refuge. (Psalms 46:6–7)