Reference for Sotah 90:4

אי הכי מאי איריא על גבי חבירו אפי' בעפר ובצרור נמי אין הכי נמי ולהודיעך כחו דר' יהודה דאמר אפי' מין במינו הוי טמון

If that is so, why use the argument 'on top of another sheaf belonging to his neighbour'? It would have been the same if he had placed it on the earth or on pebbles! That is so; but the purpose was to let you know how strong is the position of R. Judah who said that even with two things of the same kind [the lower] is regarded as hidden.

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