Mateus 6

16 And when you fast, be not as the hypocrites, sad. For they disfigure their faces, that they may appear unto men to fast. Amen I say to you, they have received their reward. 17 But thou, when thou fastest anoint thy head, and wash thy face; 18 That thou appear not to men to fast, but to thy Father who is in secret: and thy Father who seeth in secret, will repay thee.