Reference for Zevachim 38:10

רבי יונתן מ"ט לא אמר מדחזקיה אמר לך ההוא לדורות הוא דכתיב

that which is indispensable for 'his seed' is indispensable for himself, and that which is not indispensable for 'his seed' is not indispensable for himself.<span class="x" onmousemove="('comment',' 'His seed' denotes an ordinary priest, while 'statute' implies indispensability, as stated above. Hence the sanctification of the morning which is normally indispensable for an ordinary priest is indispensable for a High Priest on the Day of Atonement.');">¹⁵</span> R'Jonathan said, He deduced it from this: That Moses and Aaron and his sons might wash their hands and their feet thereat:<span class="x" onmousemove="('comment',' Ex. XL, 31.');">¹⁶</span>

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