Reference for Niddah 61:36

ספק משתמר ספק אין משתמר

grow into one and the same kind. Another exposition: If a dyer puts different ingredients into a boiler they all unite into one colour, whereas the Holy One, blessed be He, fashions the embryo in a woman's bowels in a manner that each element develops in its own natural way.<span class="x" onmousemove="('comment',' The one develops into bones, sinews, nails etc. while the other develops into skin, flesh etc., as stated supra. ');">³¹</span>

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