Reference for Bava Kamma 76:14

א"ר אבהו קנס הוא שקנס ר"מ בממונם שלא יטמעו בהם

were not suspected of being lax in [the exposing of women's stained underwear]. Now does this not prove that R. Meir was of the opinion that Cutheans were true proselytes? — R. Abbahu thereupon said: This was only a pecuniary disability that R. Meir<span class="x" onmousemove="('comment',' Who in other respects considered them true proselytes. ');">²⁴</span> imposed upon them, so that [Israelites] should not intermingle with them.

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