Reference for Berakhot 46:11
הכי קאמר בית הכסא קבוע דליכא ניצוצות שרי בית הכסא עראי דאיכא ניצוצות אסרי
But this is what he means to say: They permit a regular privy where there is no splashing [of urine likely to defile the hand which holds the Tefillin], but they prohibit a chance privy where there is this likelihood.
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