2 Kings 6:15-20 shows Elisha opening his servant's eyes to see God's army—illustrating the spiritual sight a healthy eye enables.

Isaiah 6:10 describes God closing eyes to prevent understanding—the exact opposite of a healthy eye that lets in light.

Isaiah 29:10 has God sealing the eyes of prophets—spiritual blindness that contrasts with the light-filled body from a good eye.

Isaiah 42:19 asks who is blind like God's servant—highlighting the spiritual blindness that Luke's 'bad eye' represents.

Isaiah 44:18 says eyes are plastered over so they cannot see—a vivid parallel to the darkened body from a bad eye.

Jeremiah 5:21 calls people foolish with eyes that do not see—echoing the same spiritual blindness Luke warns against.

Matthew 6:22 contains the identical saying about the eye as the lamp of the body — a direct parallel teaching.

Matthew 6:23 completes the contrast, describing the unhealthy eye causing darkness — exactly matching the second half of this verse.

Mark 4:12 describes seeing but not perceiving — spiritual blindness that parallels the 'bad eye' leaving the body full of darkness.

Acts 26:18 describes opening eyes to turn from darkness to light, using the same spiritual illumination metaphor as the eye being a lamp.

Romans 11:8-10 states God gave eyes that cannot see — spiritual blindness that mirrors the darkness from a bad eye.

2 Corinthians 4:4 says the god of this age blinds minds from seeing the gospel — directly parallels the bad eye causing spiritual darkness.

John 9:39 says Jesus came so the blind may see and those who see become blind — directly about spiritual sight versus blindness.

Mark 7:22 lists 'evil eye' (envy) as an inner sin — the same Greek phrase for a bad eye that darkens the whole body.

Psalm 119:18 prays for opened eyes to see wonders in God's law, paralleling the spiritual sight that a healthy eye brings light.

Mark 8:18 rebukes having eyes but not seeing, illustrating the spiritual blindness that an unhealthy eye brings.