Reference for Zevachim 69:7

אמר להם רבי יהודה לדבריכם למה פוקקין העזרה אמרו לו שבח הוא לבני אהרן שיהלכו עד ארכובותיהן בדם

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.');">¹¹</span> - Said they to him: It is praiseworthy for the sons of Aaron [the priests] to walk in blood up to thei ankles.

Jastrow

Jastrow