Related for Berakhot 45:15
תנו רבנן בראשונה היו מניחין תפילין בחורין הסמוכין לבית הכסא ובאין עכברים ונוטלין אותן התקינו שיהו מניחין אותן בחלונות הסמוכות לרשות הרבים ובאין עוברי דרכים ונוטלין אותן התקינו שיהא אוחזן בידו ונכנס
Our Rabbis have taught : At first people used to leave the Tefillin in holes near the privy, but mice came and carried them away ; therefore it was ordained that they should be left on window-sills near the public road ; but because passers-by used to take them, it was ordained that they should hold them in their hand and enter.
Tosefta Berakhot
A person should not go into dirty alleyways and read the Shema [there]. And not only that, but even if he already walked into [a dirty alleyway] while he was reading [the Shema], he should stop [reading it] until he completely exits from that area, and [only then] he [may continue] reading [the Shema]. A person should not stand and pray [Shmoneh Esreh] while he needs to relieve himself, as it is said, “Prepare to greet your God, Yisrael.” (Amos 4:12)
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