Strong's Concordance G573

Original Word: ἁπλοῦς
Transliteration: haploûs
Phonetic Spelling: hap-looce'
[ἁπλοῦς] probably from G1 (as a particle of union) and the base of G4120; properly, folded together, i.e. single (figuratively, clear)

Usages throughout the bible

Matthew 6:22 - The light of the body is the eye: if therefore thine eye be single, G573 thy whole body shall be full of light.

Luke 11:34 - The light of the body is the eye: therefore when thine eye is single, G573 thy whole body also is full of light; but when thine eye is evil, thy body also is full of darkness.