The Instructions of Commodianus 47

I admonish the faithful not to hold their brethren in hatred. Hatreds are accounted impious by martyrs for the flame. The martyr is destroyed whose confession is of such kind; nor is it taught that the evil is expiated by the shedding of blood. A law is given to the unjust man that he may restrain himself. Thence he ought to be free from craft; so also oughtest thou. Twice dost thou sin against God, if thou extendest strifes to thy brother; whence thou shalt not avoid sin following thy former courses. Thou hast once been washed: shalt thou be able to be immersed again?