Reference for Niddah 22:21

עבר לילה אחת בלא תשמיש וראתה טמאה

only in the case where bleeding through intercourse had not ceased, though she subsequently observed a discharge that may not have been due to intercourse;<span class="x" onmousemove="('comment',' As intercourse invariably caused the wound to bleed, any discharge of blood before the wound is healed is attributed to the same cause. ');">¹⁷</span>

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