Reference for Bava Batra 47:4

דתני ר' חייא דם הנמצא בפרוזדור חייבין עליו על ביאת מקדש ושורפין עליו את התרומה

— notwithstanding the fact that there is an 'upper chamber'<span class="x" onmousemove="('comment',' For an explanation of these terms. v. Niddah, ad init. ');">⁴</span> which is nearer. Said Raba to him: You are speaking of a case where there is 'frequency' as well as 'majority';<span class="x" onmousemove="('comment',' I.e., although the blood might have come from the 'upper chamber' which is nearer, we yet presume it to have come from the 'source' where there is more blood and whence blood more frequently flows. ');">⁵</span>

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