Reference for Niddah 66:37

רבי יוסי אומר

— Come and hear: THE DAUGHTERS OF THE SADDUCEES, SO LONG AS THEY ARE IN THE HABIT OF WALKING IN THE PATHS OF THEIR FATHERS, ARE TO BE REGARDED AS SAMARITAN WOMEN; from which it follows that if their attitude is unknown they are like Israelitish women. Read then the final clause: IF THEY LEFT THESE PATHS TO WALK IN THE PATHS OF ISRAEL, THEY ARE TO BE REGARDED AS ISRAELITISH WOMEN; from which it follows that if their attitude is unknown they are like Samaritan women! But the fact is that no inference may be drawn from this [Mishnah].

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