Reference for Eruvin 40:20

והתניא בהמה והתניא גמל

Surely, in connection with this ruling it was stated: Abaye explained: Here [we are dealing] with a manger that stands in a public domain, that is ten handbreadths high and four handbreadths wide, and one of whose sides projects into [an area] between the strips of wood [where it is possible] that the man might sometimes observe that the manger was damaged and, proceeding to repair it, would carry the bucket with him and thus carry an object from a private into a public domain. Does one, however, incur guilt in such circumstances?

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