Luke 11:34

The lamp of your body is your eye. When your eye is sound, your whole body also is full of light; but, when it is evil, your body also is dark.

Matthew 6:22-23

"The lamp of the body is the eye. If, therefore, your eye be sound, your whole body will be full of light;

Mark 4:12

that, seeing, they may see, and not perceive; and, hearing, they may hear, and not understand; lest haply they should turn, and be forgiven."

Mark 7:22

covetings, wickednesses, deceit, wantonness, an evil eye, blasphemy, pride, foolishness:

Mark 8:18

Having eyes, do ye see not? and, having ears, do ye hear not? And, do ye not remember?

Acts 2:46

And they, continuing daily with one accord in the temple, and breaking bread at their homes, were partaking of food in gladness and singleness of heart;

Acts 13:11

And now, behold, the hand of the Lord is upon you; and you shall be blind, not seeing the sun for a season." And immediately there fell on him a mist and a darkness; and, going about, he was seeking some to lead him by the hand.

Acts 26:18

to open their eyes, that they may turn from darkness to light, and from the dominion of Satan to God, that they may receive remission of sins, and an inheritance among those who have been sanctified by faith in Me.'

Romans 11:8-10

as it has been written, "God gave them a spirit of stupor, eyes that they should not see, and ears that they should not hear, unto this day."

2 Corinthians 1:12

For our glorying is this, the testimony of our conscience, that in holiness and sincerity of God, not in fleshly wisdom, but in the grace of God, we behaved ourselves in the world, and more abundantly toward you.

2 Corinthians 4:4

in whom the god of this world blinded the minds of the unbelieving, that the light of the Gospel of the glory of Christ, Who is the image of God, should not shine upon them.

2 Corinthians 11:3

but I fear lest, by any means, as the serpent beguiled Eve in his craftiness, your minds should be corrupted from the simplicity and purity which is toward Christ.

Ephesians 1:17

that the God of our Lord Jesus Christ, the Father of Glory, would give you a spirit of wisdom and of revelation in the full knowledge of Him;

Ephesians 6:5

Servants, obey your masters according to the flesh, with fear and trembling, in singleness of your heart, as to Christ;

Colossians 3:22

Servants, obey in all things your masters according to the flesh; not with eye-service, as men-pleasers, but in singleness of heart, fearing the Lord.

2 Thessalonians 2:9-12

him whose coming is according to the working of Satan in all power and signs and lying wonders,

Treasury of Scripture Knowledge

Summary

The light of the body is the eye: therefore when thine eye is single, thy whole body also is full of light; but when thine eye is evil, thy body also is full of darkness.

Bible References

Light of

Matthew 6:22
"The lamp of the body is the eye. If, therefore, your eye be sound, your whole body will be full of light;
Mark 8:18
Having eyes, do ye see not? and, having ears, do ye hear not? And, do ye not remember?
Acts 26:18
to open their eyes, that they may turn from darkness to light, and from the dominion of Satan to God, that they may receive remission of sins, and an inheritance among those who have been sanctified by faith in Me.'
Ephesians 1:17
that the God of our Lord Jesus Christ, the Father of Glory, would give you a spirit of wisdom and of revelation in the full knowledge of Him;

Single

Acts 2:46
And they, continuing daily with one accord in the temple, and breaking bread at their homes, were partaking of food in gladness and singleness of heart;
2 Corinthians 1:12
For our glorying is this, the testimony of our conscience, that in holiness and sincerity of God, not in fleshly wisdom, but in the grace of God, we behaved ourselves in the world, and more abundantly toward you.
2 Corinthians 11:3
but I fear lest, by any means, as the serpent beguiled Eve in his craftiness, your minds should be corrupted from the simplicity and purity which is toward Christ.
Ephesians 6:5
Servants, obey your masters according to the flesh, with fear and trembling, in singleness of your heart, as to Christ;
Colossians 3:22
Servants, obey in all things your masters according to the flesh; not with eye-service, as men-pleasers, but in singleness of heart, fearing the Lord.

But

Mark 4:12
that, seeing, they may see, and not perceive; and, hearing, they may hear, and not understand; lest haply they should turn, and be forgiven."
Mark 7:22
covetings, wickednesses, deceit, wantonness, an evil eye, blasphemy, pride, foolishness:
Acts 13:11
And now, behold, the hand of the Lord is upon you; and you shall be blind, not seeing the sun for a season." And immediately there fell on him a mist and a darkness; and, going about, he was seeking some to lead him by the hand.
Romans 11:8
as it has been written, "God gave them a spirit of stupor, eyes that they should not see, and ears that they should not hear, unto this day."
2 Corinthians 4:4
in whom the god of this world blinded the minds of the unbelieving, that the light of the Gospel of the glory of Christ, Who is the image of God, should not shine upon them.
2 Thessalonians 2:9
him whose coming is according to the working of Satan in all power and signs and lying wonders,