Reference for Niddah 76:13

יש מקשה עשרים וחמשה יום ואין זיבה עולה בהן

is two.<span class="x" onmousemove="('comment',' As the text speaks of Hannah's conception and birth of Samuel it follows that a viable child may be born in the seventh month after the short pregnancy of six months and two days. ');">¹²</span>

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