Reference for Chagigah 7:6
אמר מר זכורך להוציא טומטום ואנדרוגינוס בשלמא אנדרוגינוס אצטריך סלקא דעתך אמינא הואיל ואית ליה צד זכרות ליחייב קמ"ל דבריה בפני עצמו הוא
The master had said, "Your males" is to exclude the one of doubtful gender and the one of double gender. It makes sense for one of double gender that this was necessary, for you might have thought that since he has an aspect of masculinity, he should be obligated. We learn from this that he is a case unto himself. But one of doubtful gender, this is a doubt [on our part what the Torah considers him/her]. Is the verse needed to remove that doubt?
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