Jesus, via Matthew, continued with the idea of secretly giving alms or charity. When you performed charitable acts or almsgiving (σοῦ δὲ ποιοῦντος ἐλεημοσύνην), it should be so secret, that your left hand would not know (μὴ γνώτω ἡ ἀριστερά σου) what your right hand was doing (τί ποιεῖ ἡ δεξιά σου). That seems a little difficult. Thus, almsgiving in secret (ὅπως ᾖ σου ἡ ἐλεημοσύνη ἐν τῷ κρυπτῷ) would be rewarded by your heavenly Father (ὁ Πατήρ σου… ἀποδώσει σοι) who sees what is hidden in secret (ὁ βλέπων ἐν τῷ κρυπτῷ). Charitable giving is a good thing, best done in secret. Your reward will be in heaven.
This is another saying of Jesus, only found in Matthew, that carries on with the same theme of not showing off your good righteous actions. The followers of Jesus were not to give charity or alms (Ὅταν οὖν ποιῇς ἐλεημοσύνην) with a trumpet blast leading them (μὴ σαλπίσῃς ἔμπροσθέν σου). Apparently, the hypocrites were doing this in the streets and in the synagogues (οἱ ὑποκριταὶ ποιοῦσιν ἐν ταῖς συναγωγαῖς καὶ ἐν ταῖς ῥύμαις). Actually, there is no indication that any Jewish or Christian person ever did this, but certainly there was a strong emphasis on giving charity in late Second Temple Judaism. This Greek word for hypocrites “οἱ ὑποκριταὶ” originally meant actors or someone who sought praise, while acting deceitfully. According to Matthew, these hypocrites were usually the enemies of Jesus. They wanted glory and praise from other men (ὅπως δοξασθῶσιν ὑπὸ τῶν ἀνθρώπων·) for their good works. However, Matthew has Jesus give a solemn saying (ἀμὴν λέγω ὑμῖν) concluding that these men who sought human appeal have already received their reward (ἀπέχουσιν τὸν μισθὸν αὐτῶν). Charitable giving should be done quietly without any fanfare.