Reference for Pesachim 33:2

גופא רב אמר אישתבש כהני ושמואל אמר לא אישתבש כהני

Rab learned, 'the liquids of the slaughter-house'; but the liquids of the altar<span class="x" onmousemove="('comment',' In the Aramaic, 'slaughter-house' and 'altar' differ in one letter only.');">²</span> can be defiled.<span class="x" onmousemove="('comment',' Blood and water are the liquids of the slaughter-house, but wine and oil are liquids of the altar.');">³</span>

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