Matthew 6:15-17

15but if ye do not forgive men their offences, neither will your Father forgive your offences.

16And when ye fast, be not as the hypocrites, downcast in countenance; for they disfigure their faces, so that they may appear fasting to men: verily I say unto you, They have their reward.

17But thou, [when] fasting, anoint thy head and wash thy face,