From the Exodus Out of Egypt to the Rejection of That Generation - Flavius Josephus

Chapter 12
Several Laws
1. As for adultery, Moses forbade it entirely, as esteeming it a happy
thing that men should be wise in the affairs of wedlock; and that it was
profitable both to cities and families that children should be known to be
genuine. He also abhorred men's lying with their mothers, as one of the
greatest crimes; and the like for lying with the father's wife, and with aunts,
and sisters, and sons' wives, as all instances of abominable wickedness. He
also forbade a man to lie with his wife when she was defiled by her natural
purgation: and not to come near brute beasts; nor to approve of the lying with
a male, which was to hunt after unlawful pleasures on account of beauty. To
those who were guilty of such insolent behavior, he ordained death for their
punishment.
2. As for the priests, he prescribed to them a double degree of purity (1)
for he restrained them in the instances above, and moreover forbade them to
marry harlots. He also forbade them to marry a slave, or a captive, and such
as got their living by cheating trades, and by keeping inns; as also a woman
parted from her husband, on any account whatsoever. Nay, he did not think it
proper for the high priest to marry even the widow of one that was dead,
though he allowed that to the priests; but he permitted him only to marry a
virgin, and to retain her. Whence it is that the high priest is not to come near
to one that is dead, although the rest are not prohibited from coming near to
their brethren, or parents, or children, when they are dead; but they are to be
unblemished in all respects. He ordered that the priest who had any blemish,
should have his portion indeed among the priests, but he forbade him to
ascend the altar, or to enter into the holy house. He also enjoined them, not
only to observe purity in their sacred ministrations, but in their daily
conversation, that it might be unblamable also. And on this account it is that
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