Reference for Berakhot 45:10

איבעיא להו מהו שיכנס אדם בתפילין לבית הכסא קבוע להשתין מים רבינא שרי רב אדא בר מתנא אסר אתו שיילוה לרבא אמר להו אסור חיישינן שמא יפנה בהן ואמרי לה שמא יפיח בהן

The question was raised : May a man, wearing his Tefillin, enter a regular privy for the purpose of urinating? Rabina permitted it; Rab Adda b. Mattena prohibited it. The question was put to Raba, and he replied : It is forbidden, because we are afraid that he may relieve himself otherwise while wearing them. Another version is : [We are afraid] that he may break wind while wearing them.

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