Reference for Sanhedrin 149:19

אמר מר מנין לעשות זכרים כנקבות מאי זכרים כנקבות אילימא בת בנה כבת בתה בהדי הדדי קאתיאן

The Master said: 'Whence do we know that males are as females?' What is meant by this? Shall we say that her son's daughter is equally forbidden as her daughter's daughter?<span class="x" onmousemove="('comment',' The meaning being, the issue of males is prohibited just as that of females. ');">¹⁵</span>

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