Isaiah 48:7

They are created now, and not from the beginning; even before the day when thou heardest them not; lest thou shouldest say, Behold, I knew them.

Cross-reference

Job 32:13 warns against claiming wisdom, similar to the warning here against saying 'I knew them' — both caution human presumption.

1 Corinthians 2:7 reveals God's secret wisdom hidden before ages, parallel to the hidden things newly created in Isaiah 48:7.