Luke 11:34 in the King James Version
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.
Context
33 “No one, when he has lit a lamp, puts it in a cellar or under a basket, but on a stand, that those who come in may see the light.
34 The lamp of the body is the eye. Therefore when your eye is good, your whole body is also full of light; but when it is evil, your body also is full of darkness.
35 Therefore see whether the light that is in you isn’t darkness.