Matthew 6:1-5, 16

Take heed that ye do not your righteousness before men, to be seen of them: else ye have no reward with your Father who is in heaven. When therefore thou doest alms, sound not a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have received their reward. But when thou doest alms, let not thy left hand know what thy right hand doeth: that thine alms may be in secret: and thy Father who seeth in secret shall recompense thee. And when ye pray, ye shall not be as the hypocrites: for they love to stand and pray in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have received their reward.

Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may be seen of men to fast. Verily I say unto you, They have received their reward.