Commentary for Berakhot 46:5
כי תניא ההיא לענין טפח וטפחיים דתני חדא כשהוא נפנה מגלה לאחריו טפח ולפניו טפחיים ותניא אידך לאחריו טפח ולפניו ולא כלום
To what, then, does the quoted statement refer? To the question of one handbreadth or two. For one teacher states : When a man relieves himself, he should uncover himself one hand-breadth behind and two in front; and there is another teaching: He should uncover himself one handbreadth behind and not at all in front.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Not more, from a sense of modesty.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
To avoid soiling his clothes.
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