Matthew 6, 1-4
Beware of practicing your piety before men in order to be seen by them; for then you will have no reward from your Father who is in heaven. Thus when you give alms, sound no trumpet before you, as the hypocrites do in the synagogues and in the streets, that they may be praised by men. Truly, I say to you, they will have their reward. But when you give alms, let your left hand not know what your right hand is doing, so that your alms may be in secret; and your Father who sees you in secret will reward you.