Matthew 6:16-18 - The Sermon On The Mount: How To Fast
16 "And, when ye fast, be not as the hypocrites, of a sad countenance; for they disfigure their faces, that they may appear to men to fast. Verily I say to you, they receive their reward. 17 But, when fasting, anoint your head, and wash your face, 18 that you appear not to men to be fasting, but to your Father Who is in secret; and your Father Who seeth in secret will recompense you.