Commentary for Berakhot 20:28
וא"ר יוסי בר' חנינא משום ראב"י המתפלל צריך שיכוין את רגליו שנא' (יחזקאל א, ז) ורגליהם רגל ישרה
R. Jose b. R. Hannina also said in the name of R. Eliezer b. Jacob : Whoever prays must direct his feet ; as it is said, "And their feet were straight feet" (Ezek. i. 7).
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Lit. "a straight foot" i.e. they were placed together so as to appear like one foot. That is the correct posture for the Tefillah. J. T. offers two reasons: (1) to imitate the angels; (2) to imitate the priests in the Temple.
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