Matthew 6:3-4

6:3 But when you do your giving, do not let your left hand know what your right hand is doing, 6:4 so that your gift may be in secret. And your Father, who sees in secret, will reward you.

Matthew 6:2

6:2 Thus whenever you do charitable giving, do not blow a trumpet before you, as the hypocrites do in synagogues and on streets so that people will praise them. I tell you the truth, they have their reward.