Commentary for Kiddushin 49:4
אתא לקמיה דרב חסדא א"ל מתניתא בעו מינך דתנן עשרים וארבעה ראשי אברים שבאדם כולם אין מטמאין משום מחיה
You are not Hamnuna, but Karnuna,' jeered they.<span class="x" onmousemove="('comment',' Rashi connects Karnuna with karona, the market: 'you have frittered your time away in the market place, gossiping, otherwise you could have answered us.' Tosaf. Ham-nuna = a hot fish; Kar-nuna = a cold fish. 'you are a cold fish, not hot' - your knowledge is lifeless.');"><sup>7</sup></span> When he came before R'Hisda, he said to him: They asked you a<big><b>MISHNAH:</b></big> For we learnt: As to the twenty-four tips of limbs of a man, none of these become unclean on account of raw flesh.<span class="x" onmousemove="('comment',' V. Lev. XIII, 10: 'and there be quick raw flesh in the rising'.');"><sup>8</sup></span>