Reference for Niddah 57:21

תנן

but R. Johanan ruled: The head has the same status as the greater part of the limbs. They thus differ on the validity of Samuel's principle.<span class="x" onmousemove="('comment',' R. Eleazar agreeing with Samuel while R. Johanan differs from him. According to the former version (which attaches the dispute to our Mishnah) it might be maintained (as has been submitted supra) that R. Eleazar also differs from him. ');">¹⁹</span>

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