A kohen whose kiddushin is with a woman who is prohibited to him and who is the intimate with her – he gets two counts against him, one for each prohibition. The idea is that kiddushin is prohibited for the way it leads to a prohibited sexual relationship. Also, a new mishnah about how a father and even both parents can’t declare their child (or child-to-be) a mamzer.
To listen: Click the link above. Or subscribe wherever you get your podcasts. Or join the Talking Talmud WhatsApp group, and receive the link as soon as it goes up.