Matthew 6:22
The eye is the lamp of the body. If thine eye he clear, thy whole body will be in light;
Luke 11:34-36
The lamp of the body is thine eye. When thine eye is clear, thy whole body also is in the light; but when it is disordered, thy body also is in darkness.
2 Corinthians 11:3
but I fear, lest by any means, as the serpent beguiled Eve by his subtlety, so your minds should be corrupted from singleheartedness toward Christ.
Colossians 3:22
Bondservants, obey in all things your masters according to the flesh, not with eyeservice, as menpleasers, but in singleness of heart, fearing the Lord.
Acts 2:46
And attending daily with one accord in the temple, and breaking bread in a private house, they partook of their food with gladness and singleness of heart,
Ephesians 6:5
Bondservants, obey your masters according to the flesh, with fear and trembling, in singleness of your heart, as serving Christ;