Mark 8:18 directly echoes the same indictment: having eyes but not seeing, ears but not hearing, applied to the disciples.

Matthew 13:15 continues the same quotation of Isaiah 6:10 in Matthew's gospel.

Hebrews 6:6 describes those who cannot be restored to repentance, paralleling Mark's theme of hardened hearts.

Romans 11:8-10 cites Isaiah and Psalm about divinely given spiritual blindness, echoing the theme of hardening.

Acts 28:25-27 quotes the same Isaiah 6 passage, applying it to Jewish rejection of the gospel.

John 12:37-40 cites Isaiah 6:10 to explain unbelief, directly connecting to this saying.

Luke 8:10 gives Luke's parallel: parables hide truth from outsiders, quoting Isaiah.

Deuteronomy 29:4 describes the same divinely given inability to understand—Israel's spiritual dullness.

Matthew 13:14 is the parallel account where Jesus explicitly cites Isaiah 6:9.

Jeremiah 5:21 rebukes Israel with the same 'eyes but see not, ears but hear not'.

Isaiah 6:10 continues the quote—God blinds eyes and dulls hearts to prevent repentance.

Isaiah 6:9 is the direct source Jesus quotes here—'keep on hearing but do not understand'.

Ezekiel 12:2 uses the same 'eyes but see not, ears but hear not' language for rebellious Israel, directly parallel to Jesus' quotation of Isaiah.

John 12:40 quotes the same Isaiah 6:10 passage, explaining that God blinded eyes and hardened hearts to prevent repentance.

Acts 28:26 quotes Isaiah 6:9-10 verbatim, the same source Jesus paraphrases here about hearing without understanding.

Zechariah 7:12 describes hearts made hard like adamant to prevent hearing, mirroring the spiritual deafness Jesus cites.

Isaiah 44:18 echoes the theme of blind eyes and closed hearts, but in context of idolatry.