Leviticus 15:24

Seven days If he did this ignorantly; but if it were done with his own knowledge, and that of the woman, they were both, after being accused and convicted, to be punished with death, Leviticus 20:18; for as there was a turpitude in the action, so it would be very prejudicial to the children should any be then begotten, as they would probably be weak or leprous. Hence an excellent author is of opinion that this law was given for this very reason, to prevent the Jews from contracting and propagating some grievous disorder. Moses, or rather God, the author of the Mosaic law, by this prohibition, as in many other instances, consulted the health and safety of his people. To this we may add, that it would have redounded to the dishonour of God, and of the true religion, if the professors thereof should give such public evidence of their intemperance.