Psalm 94:11 is the exact source Paul quotes: 'The Lord knows the thoughts of the wise, that they are futile.'

Romans 1:21 says people 'became futile in their thinking' — directly echoing the same concept of futile thoughts from Psalm 94:11.

Colossians 2:8 warns against philosophy and empty deceit — the same kind of worldly wisdom Paul dismisses as futile.

In Isaiah 44:25, God frustrates diviners and turns wise men backward — a strong OT parallel to Paul's claim that wise thoughts are futile.

In Isaiah 19:3, God promises to destroy the counsel of Egypt, echoing the theme that human wisdom fails against God's knowledge.

Obadiah 1:8 describes God destroying wise men from Edom — a thematic parallel to God rendering human wisdom futile.