Matthew 6:1

Προσέχετε τὴν ἐλεημοσύνην ὑμῶν μὴ ποιεῖν ἔμπροσθεν τῶν ἀνθρώπων, πρὸς τὸ θεαθῆναι αὐτοῖς· εἰ δὲ μήγε, μισθὸν οὐκ ἔχετε παρὰ τῷ Πατρὶ ὑμῶν τῷ ἐν τοῖς οὐρανοῖς.

Take heed that you do not give your alms before men, to be seen by them; otherwise you have no reward from your Father who is in Heaven.