Matthew 6:15-17

15But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.

16Moreover when ye 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. 17But thou, when thou fastest, anoint thine head, and wash thy face;