Talmud (Rodkinson)/Seder Moed/Tractate Shabbat 2 b
Why is this teaching here specified as two respectively four on the inside, and two respectively four on the outside, and there no such specification was made? Said R. Papa: Here the special subject of treatment is the Sabbath, and the Mishna enumerated the cases which involve guilt and those which do not involve guilt; while there the principal subject of treatment is a different one, and he mentions only the cases that involve guilt, leaving the cases that do not involve guilt untouched. But the cases that involve guilt are those by which acts of transfer are committed, and such are only two? Nay, there are two acts of transfer from within and two from without. But the Mishna says, "Yetziath" (which in a literal sense means transfer from within)? Said R. Ashi: The Tana calls transfer from without by the same term. And for what reason? Because every act of removing a thing from its place is called Yetziah. Said Rabbina: The Mishna also bears out this sense; for it speaks of Yetziath and immediately illustrates its remark by citing a case from without. This bears it out. Rabha, however, says: He (the Tana) speaks about divided premises (whose line of division is crossed), and in this case there are only two (in each of which there may be four acts of transfer).
Said R. Mathna to Abayi: Are there not eight, even twelve (instances of transfer over the line of division)?3