Reference for Sanhedrin 133:11

רב פפא אמר כי קתני מסית זה הדיוט להכמנה

For it has been taught: And for all others for whom the Torah <font>decrees death</font>, witnesses are not hidden, excepting for this one. How is it done? — A light is lit in an inner chamber, the witnesses are hidden in an outer one [which is in darkness], so that they can see and hear him,<span class="x" onmousemove="('comment',' Otherwise, they could not testify. ');">¹¹</span>

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