Reference for Moed Katan 47:2

יתבי רבנן קמיה דרב פפא וקאמרי משמיה דשמואל אבל ששימש מטתו בימי אבלו חייב מיתה א"ל רב פפא אסור אתמר ומשמיה דר' יוחנן אתמר

Some Rabbis sitting in the presence of R'Papa reported in the name of Samuel that a mourner who used the conjugal couch during the [seven] days of his mourning is guilty of a mortal offence. Said R'Papa to them, What was reported was that it is 'forbidden', not 'a mortal offence', and in the name of R'Johanan it was reported [and not in the name of Samuel]; and if you heard aught [condemned] in the name of Samuel [as a mortal offence] it was this: 'Said R'Tahlifa B'Abimi, as reporting Samuel, A mourner who did not let his hair grow long and did not rend his clothes is guilty of a mortal offence.

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