Commentary for Berakhot 49:4
ורב חסדא אמר אסור לקרות ק"ש מ"ט דרב חסדא דכתיב (תהלים לה, י) כל עצמותי תאמרנה ה' מי כמוך:
And Rab Hisda said : It is forbidden to read the Shema' [in such circumstances] — what is the reason ? Because it is written, "All my bones shall say, Lord who is like unto Thee" (ibid. xxxv. 10).
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
I.e. limbs; they all have to be clean or in a clean place.
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