Reference for Pesachim 40:5

ומשני הא ר"ש ואליבא דר' יהושע הא ר' יוסי ואליבא דר' יהושע

So too do we admit in the case of terumah which was defiled through a derivative uncleanness, that we may burn it together with terumah which was defiled through a 'father' of uncleanness. But how can we burn even that which is doubtful together with that which is unclean: perhaps Elijah will come and declare it clean!<span class="x" onmousemove="('comment',' V. supra p. ');">⁴</span>

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