Reference for Berakhot 51:2
כמה ירחיק מהן ומן הצואה ארבע אמות: אמר רבא אמר רב סחורה אמר רב הונא לא שנו אלא לאחוריו אבל לפניו מרחיק מלא עיניו וכן לתפלה
To what distance must he remove himself from it and excrement [if he wishes to read the Shema'] ? Four cubits. Raba said in the name of Rab Sahorah in the name of Rab Huna : This teaching applies only to [excrement which is behind him ; but if it is in front of him, he must remove himself as far as the eye can see it. Similarly is it with the Tefillah.
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