Philo Judaeus De Josepho 44

[44] I, therefore, having kept myself pure to this day, will not begin now to transgress the law by adultery which is the greatest of all sins, when I ought rather, even if in past time I had lived in an irregular manner, and had been led away by the impulses of youth, and had imitated the licentiousness of the natives, still not to seek to pollute the marriage of another man, an offence which who is there who would not avenge with blood? For though different nations differ in other points, still all agree in this alone, that all men think him worthy of ten thousand deaths who does so, and give up the man who is detected in adultery without trial to the husband who has detected him.