Matthew 6:2-4

2So when you give to the needy, do not sound a trumpet before you, as the hypocrites do in the synagogues and on the streets, to be honored by men. Truly I tell you, they already have their full reward. 3But when you give to the needy, do not let your left hand know what your right hand is doing, 4so that your giving may be in secret. And your Father, who sees what is done in secret, will reward you.