So he that goeth in to his neighbor’s wife; whosoever toucheth her shall not be innocent.
– Proverbs 6:29
The previous two verses are aimed at the one who goes in to his neighbor’s wife. He has embraced fire and walked upon a path of burning coals. The consequential burning is obvious. Touch is euphemistic for physical passion. He who does so will not go unpunished, as the word for innocent indicates. Punishments come from different directions to the adulterer and he will receive some or all of them. Solomon enumerates many of those punishments in his warnings.