4 I do not suppose that you will consent, or even listen, to such things as that a father-in-law should lie with his daughter-in-law, as Judah did; or a father with his daughters, like Lot; or prophets with harlots, like Hosea; or that a husband should sell his wife for a night to her lover, like Abraham; or that a man should marry two sisters, like Jacob; or that the rulers of the people and the men you consider as most inspired should keep their mistresses by hundreds and thousands; or, according to the provision made in Deuteronomy about wives, that the wife of one brother, if he dies without children, should marry the surviving brother, and that he should raise up seed from her instead of his brother; and that if the man refuses to do this, the fair plaintiff should bring her case before the elders, that the brother may be called and admonished to perform this religious duty; and that, if he persists in his refusal, he must not go unpunished, but the woman must loose his shoe from his right foot, and strike him in the face, and send him away, spat upon and accursed, to perpetuate the reproach in his family. These, and such as these, are the examples and precepts of the Old Testament. If they are good, why do you not practise them? If they are bad, why do you not condemn the Old Testament, in which they are found? But if you think that these are spurious interpolations, that is precisely what we think of the New Testament. You have no right to claim from us an acknowledgment for the New Testament which you yourselves do not make for the Old.
Source: Reply to Faustus the Manichaean (New Advent)