Cyprian of Carthage, Three Books of Testimonies Against the Jews III.41: That we must not labour noisily nor boastfully

In the Gospel according to Matthew: “Let not thy left hand know what thy right hand doeth, that thine alms may be in secret; and thy Father, which seeth in secret, shall render to thee.” Also in the same place: “When thou doest an alms, do not sound a trumpet before thee, as the hypocrites do in the streets and in the synagogues, that they may be glorified of men. Verily I say unto you, They have fulfilled their reward.”