Reference for Keritot 24:24

מודה ר"מ לחכמים בנזיר טמא שאמרו לו שנים

Now I might have thought that R'Joshua upholds his rule only if it leads to greater stringency but not if greater leniency results from it; therefore we are taught: IF OF TWO KINDS, HE IS EXEMPTED: 'Two kinds' means in fact 'one kind';<span class="x" onmousemove="('comment',' I.e., two pieces of heleb, e.g., each of the size of half an olive, eaten in two meals.');">¹⁵</span>

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