Reference for Chullin 100:26

כל הכרס כולו זו היא כרס הפנימית

But it is obvious, is it not that where the greater portion was torn, though it was not the extent of a handbreadth, [it is trefah]? - It was only necessary to be stated with regard to such a case as where the laceration [extended over the greater portion but it] would have made up a handbreadth had it only been torn a little more, for then you might have said that it was not trefah until the extent of a handbreadth was torn; he therefore teaches [that it is no so].

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