Reference for Niddah 23:31

אלא אמר רבא צנועות עד שבדקו בו עצמן לפני תשמיש זה אין בודקות בו לפני תשמיש אחר

virtuous man but would not be called wicked? Rather, said Raba, as for virtuous women the testing-rag, with which they have examined themselves before one intercourse, they do not use it before any other intercourse, but those who are not virtuous use it and do not mind.

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