Reference for Niddah 144:14

תנן

— No, it is only the view of Beth Hillel. For it was taught: Said R. Judah to Beth Hillel: Do you then call such an act improper conduct, seeing that this man only intended to have intercourse with a menstruant? — 'A menstruant'! How could such an idea be entertained? — Rather read: To have intercourse with a zabah. 'A zabah'! How could this idea be entertained? — Rather read: To have intercourse with one who waits a day for a day.

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