Moreover when you fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
All Commentaries on Matthew 6:16 Go To Matthew 6
Theophylact of Ochrid
AD 1107
"Disfigurement of the face" is an artificial discoloration of the face, painting it pale, so that one does not appear as he really is, but feigns mournfulness.