A.T. Robertson Commentary Luke 5:31

"And Jesus answering said unto them, They that are in health have no need of a physician; but they that are sick." — Luke 5:31 (ASV)

They that are whole (ο υγιαινοντες). Old Greek word for good health from υγιης, sound in body. So also in Lu 7:10; 15:27; 3 John 1:2. This is the usual word for good health used by Greek medical writers. Mr 2:17; Matthew 9:12 have ο ισχυοντες (those who have strength).