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Our Daf Yoma 25 inquires: Who receives the blood? Do we say that he who slaughtered it receives it, for if you were to say that the one who throws the blood receives it, perhaps in his enthusiasm (to throw the blood), he may not receive the whole blood; or does the thrower receive it, for if you were to say that he who slaughters the animal receives the blood, occasionally a non-Kohen slaughters the animal?
The Gemora resolves this from the following braisa:
B Ben Katin made twelve spouts for the Kiyor, so that his twelve brethren, the Kohanim, who are involved with the tamid offering, may simultaneously wash their hands and feet. Now, if you were to think that he who slaughters the animal also receives its blood, there would be thirteen. Must we not therefore infer from there that he who throws the blood receives the blood? This indeed proves it.
We will be meeting this Ben Katin in the next perek but for now we examine the Kiyor and its metaphorical significance for our spiritual journey.