Proverbs 16:25 warns a way that seems right leads to death — parallels the caution that the light in you might be darkness.

Proverbs 26:12 says those wise in their own eyes are worse than fools — parallels the danger of mistaking darkness for light.

Isaiah 5:20 warns of calling evil good and darkness light — the exact inversion Jesus warns against when he says 'the light in you be darkness.'

John 9:39-41 describes Jesus bringing judgment so the blind see and the seeing become blind — directly illustrating the peril of claiming light while in darkness.

James 3:13-17 contrasts earthly wisdom (darkness) with heavenly wisdom (light) — directly relevant to the warning about inner light turning dark.

Revelation 3:17 describes self-deceived blindness — thinking you have light when you are actually in darkness, directly echoing this warning.

Romans 2:19-23 describes a teacher of the law who disobeys — the light of knowledge becomes darkness through hypocrisy, paralleling Jesus' warning.

Isaiah 5:21 condemns those wise in their own eyes — a self-deception that turns inner light into darkness, matching Jesus' warning.

Jeremiah 8:9 says those who reject God's word have no real wisdom — their supposed light is actually darkness, echoing Jesus' caution.

Matthew 6:1 warns against hypocritical righteousness for show — a practical example of when the inner light might become darkness through wrong motives.

Romans 1:22 says those claiming to be wise became fools — their inner light turned to darkness, matching the self-deception Jesus warns about.

Jeremiah 8:8 exposes scribes who claim wisdom from the law yet handle it falsely — a case of trusted light becoming darkness.

2 Peter 1:9 describes blindness from lacking virtues — a state of inner darkness like the warning here of light becoming darkness.