Cyprian of Carthage, Three Books of Testimonies Against the Jews III.96: That we are to live with the good, but to avoid the evil

In Solomon, in the Proverbs: “Bring not the impious man into the habitation of the righteous.” Also in the same, in Ecclesiasticus: “Let righteous men be thy guests.” And again: “The faithful friend is a medicine of life and of immortality.” Also in the same place: “Be thou far from the man who has the power to slay, and thou shalt not suspect fear.” Also in the same place: “Blessed is he who findeth a true friend, and who speaketh righteousness to the listening ear.” Also in the same place: “Hedge thine ears with thorns, and hear not a wicked tongue.” Also in the seventeenth Psalm: “With the righteous Thou shalt be justified; and with the innocent man Thou shalt be innocent; and with the froward man Thou shalt be froward.” Also in the first Epistle of Paul to the Corinthians: “Evil communications corrupt good dispositions.”