Commentary for Berakhot 49:10
אמר אביי מנא אמינא לה דתנן הטמא עומד תחת האילן והטהור עובר טמא טהור עומד תחת האילן וטמא עובר טהור ואם עמד טמא וכן באבן המנוגעת
Abbai said : Whence do I derive my opinion ? For there is a Mishnaic teaching : If a ritually unclean person is standing under a tree and a person who is ritually clean passes by him, the latter also becomes defiled. If, however, a person ritually clean is standing under a tree and an unclean person passes by, the former remains in his state of purity; but should [the unclean person] remain standing there, then the former becomes unclean. The same law holds good with a stone which has become infected.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
E.g. a leper.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
According to Abbai, this is analogous to the quoted Baraita ; so if the passing leper does not cause defilement, the passing manure should not interfere with the reading of the Shema'.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Cf. Lev. xiv. 37 ff. If the stone is carried past a man, he is not infected ; if it is set down where he is, he does contract defilement.
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