Reference for Niddah 38:53

עד בן עשרים

— R. Nahman b. Isaac replied: Where, for instance, the woman entered the bridal chamber but had no intercourse.<span class="x" onmousemove="('comment',' So that the blood is in reality that of an unmarried man (cf. prev. n. but one). ');">⁴⁵</span>

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