Reference for Zevachim 187:6

דבר שהוא ראוי לקבל טומאה [וכו']: סתמא כרבי יהודה

until he trims it. ONLY THE PLACE OF THE BLOOD NEEDS WASHING. How do we know it? - For our Rabbis taught: You might think that if [the blood] spurted on part of the garment, the whole garment must be washed.

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