"If, therefore, any one makes the accusation, and furnishes proof that the said men [Christians] do anything contrary to the laws, you shall adjudge punishments in proportion to the offences. And this, by Hercules, you shall give special heed to, that if any man shall, through mere calumny, bring an accusation against any of these persons [Christians], you shall award to him more severe punishments in proportion to his wickedness."
source
The first apology of Justin, chapter LXVIII. In ANF1, that is, Roberts A, Donaldson J and Coxe AC (1885) Ante-Nicene Fathers, Vol 1. [Justin quotes from a letter of c122AD from the Emperor Hadrian to Minucius Fundanus. ANF1 footnote: "Generally credited a