חולין 112:2 — Soncino English Talmud

and to pour off [the fat]. But did Samuel really say so? Has not Samuel stated that a loaf [of bread] upon which one cut [roast] meat may not be eaten? — It is different in that case for it [the blood] exudes only by reason of the pressure of the knife. R. Nahman said: If fish and fowl were salted together, they are forbidden. What are the circumstances here? If the vessel [in which they were salted] was not perforated then fowl with other fowl would also be forbidden, and if the vessel was perforated then even fish with fowl should be permitted? — Indeed the vessel was perforated, but fish, having a soft skin, very quickly exude [their juice], whereas fowl are constricted and exude [blood] long after the fish have ceased to do so, so that the latter will absorb from [the fowl]. It happened to R. Mari b. Rahel that ritually slaughtered meat had been salted with trefah meat. He came before Raba who sa d to him, It is written: The unclean, to signify that the juice and the broth and the sediment of these [which are unclean] are forbidden.9^ᵃ^ᵇ^ᶜ^ᵈ^ᵉ^ᶠ^ᵍ^ʰ^ⁱ

^ᵃnote:The effect of the salt is to draw the blood together so as to settle at the base of the vessel, leaving the fat on top; the fat can then very easily be poured off into another vessel, and it may be eaten.
^ᵇnote:That once the redness of the meat has gone no more blood will exude from it.
^ᶜnote:Because of the blood which has exuded from the roast meat.
^ᵈnote:I.e., the fish, for the blood that is exuded from the fowl will be absorbed by the fish.
^ᵉnote:It is forbidden to salt meat in a vessel that is not perforated. V. infra 113a.
^ᶠnote:On the other hand meat with other meat may very well be salted together, for each piece will take an equal length of time to exude the blood and so long as it exudes it will not absorb.
^ᵍnote:In a perforated vessel.
^ʰnote:Lev. XI, 31: These are the unclean unto you among all that creep. It is apparent that the definite article before ‘unclean’ is superfluous.
^ⁱnote:And therefore in the case of the trefah meat being salted with ritually slaughtered meat, whilst it is true that one will not absorb blood from the other because each is discharging it, each will however absorb the juice from the other, so that the ritually slaughtered meat would be rendered forbidden on account of the juice of the other.