Reference for Zevachim 68:10

קיבל הכשר ונתן לפסול כו':

but they [the other goblets] are poured out into the duct.<span class="x" onmousemove="('comment',' Because one goblet renders another rejected.');">¹¹</span> R'Eleazar son of R'Simeon said: Whence do we know that, if [the priest] received the blood of the sin-offering in four goblets and made the four applications from one goblet, all are poured out at the base?

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