Reference for Pesachim 130:2

תניא אמר להן ר' יהודה לחכמים לדבריכם למה פוקקין את העזרה אמרו לו שבח הוא לבני אהרן שילכו עד ארכובותיהם בדם

It was taught, R'Judah said to the Sages: On your view, why did they stop up [the holes in] the Temple Court?<span class="x" onmousemove="('comment',' On the eve of Passover they stopped up the holes through which the blood of the sacrifices passed out to the stream of Kidron.');">³</span> Said they to him: It is praiseworthy for the sons of Aaron [the priests] to walk in blood up to their ankles.

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