Contradiction with Proverbs 19:21
This verse states that there are many plans in a man's heart, but the counsel of the Lord will stand, which contrasts with the assertion in Isaiah 8:10 that plans against God's will shall not stand.
Proverbs 19:21: [There are] many devices in a man's heart; nevertheless the counsel of the LORD, that shall stand.
Contradiction with Psalm 33:10
This verse states that the Lord brings the counsel of nations to nothing and makes the devices of people of no effect, contradicting the idea that plans shall not prosper against God's counsel as in Isaiah 8:10.
Psalm 33:10: The LORD bringeth the counsel of the heathen to nought: he maketh the devices of the people of none effect. [bringeth: Heb. maketh frustrate]
Contradiction with Proverbs 21:30
This verse asserts that there is no wisdom, understanding, or counsel against the Lord, contradicting the implication in Isaiah 8:10 that consulting together can succeed if against God's purpose it won't.
Proverbs 21:30: [There is] no wisdom nor understanding nor counsel against the LORD.
Contradiction with Job 5:12
This verse indicates that God frustrates the devices of the crafty, so their hands cannot carry out their plans, which opposes the viewpoint in Isaiah 8:10 that taking counsel together would come to nothing.
Job 5:12: He disappointeth the devices of the crafty, so that their hands cannot perform [their] enterprise. [their enterprise: or, any thing]
Contradiction with Jeremiah 29:11
This verse emphasizes that God knows the thoughts and plans He has for people, plans for peace not evil, contradicting Isaiah 8:10, which conveys the negative planning or plotting.
Jeremiah 29:11: For I know the thoughts that I think toward you, saith the LORD, thoughts of peace, and not of evil, to give you an expected end. [expected...: Heb. end and expectation]