Reference for Niddah 56:19

ורב מאי שנא ביאת מקדש דלא דכתיב מזכר ועד נקבה תשלחו זכר ודאי נקבה ודאית ולא טומטום ואנדרוגינוס

is required for an exposition like the one made by R. Isaac; for R. Isaac stated: 'whether it be a man'<span class="x" onmousemove="('comment',' Lev. XV, 33. ');">²⁶</span> includes<span class="x" onmousemove="('comment',' Since the expression is not required for the context which spoke previously in general terms in the same verse 'of them that have an issue'. ');">³⁰</span>

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