Reference for Zevachim 187:7

ראוי לכיבוס למעוטי כלי דבר גרידה הוא:

Therefore it states, '[thou shalt wash] that whereon it was sprinkled': I ordered thee [to wash] only the place of the blood. WHATEVER IS ELIGIBLE TO CONTRACT UNCLEANNESS. This anonymous teaching agrees with R'Judah.<span class="x" onmousemove="('comment',' Though its author is not named, we know from the Baraitha that it is R. Judah's view. - When an individual's view is stated anonymously in the Mishnah, it is generally the halachah.');">¹⁰</span>

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