Reference for Niddah 33:21

והוא שלנו בכלי מתכות וכלי נתר ככלי מתכות דמו

children; and if intercourse took place after both husband and wife have been bled, they will have children afflicted with ra'athan.<span class="x" onmousemove="('comment',' Ra'athan is one of the skin diseases causing extreme debility and nervous trembling. Cf. Keth. (Sonc. ed.) p. 486f. ');">¹⁷</span>

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