Reference for Niddah 121:24

ורבנן בשלמא התם אימא עורב נטלה אלא הכא האי דם מהיכא אתא

It was taught: R. Meir stated, It once happened that a sycamore tree at Kefar Saba, held to be in a presumptive state of uncleanness, was examined and no object of uncleanness was found. After a time the wind blew upon it and uprooted it when the skull of a corpse was found stuck in its root.<span class="x" onmousemove="('comment',' This, in the opinion of R. Meir, proves that an examination that revealed no unclean object is no evidence of cleanness. ');">²³</span>

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