Reference for Zevachim 38:6

א"ל אמר קרא (ויקרא טז, ד) ולבשם לבישה מעכבת ואין דבר אחר מעכב

Said R'Assi to R'Johanan: Consider: The five immersions and the ten sanctifications<span class="x" onmousemove="('comment',' Five for the hand and five for the feet.');">⁷</span> are scriptural, and 'statute' is written in connection with them; then let them be indispensable?<span class="x" onmousemove="('comment',' So that the service should be invalid.');">⁸</span>

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