Reference for Shevuot 34:3
גופא אמר רב הונא זר שהפך בצינורא חייב מיתה ה"ד אי דלא הפך לה לא מיעכלי פשיטא ואי דלא הפך בהו נמי מיעכלי מאי קא עביד
If, without turning it, it would not have been consumed, this is self-evident! And if, without turning it, it would also have been consumed, then what has he done? - It is not necessary [for R'Huna to state his law except] in a case where if he had not turned it, it would have been consumed in two hours, and now [after turning it] it is consumed in one hour; and this [law] he teaches us, that an acceleration of the service is also a service. R'Oshaia said: I wish to state a law, but am afraid of my associates: He who enters a house plagued by leprosy,<span class="x" onmousemove="('comment',' V. Lev. XIV, 33 seq.');"><sup>5</sup></span> backwards, even with his whole body [inside] except his nose, is clean, for it is written: He that cometh into the house.