Reference for Kiddushin 140:9
ההוא יומא אקרען כמה כתובתא בנהרדעא כי קא נפיק נפקי אבתריה למירגמיה אמר להו אי שתיקו שתיקו ואי לא מגלינא עלייכו הא דאמר שמואל תרתי זרעייתא איכא בנהרדעא חדא מיקריא דבי יונה וחדא מיקריא דבי עורבתי וסימניך טמא טמא טהור טהור שדיוה לההוא ריגמא מידייהו וקם אטמא בנהר מלכא
[But] he threatened them, 'If you will be silent, be silent; if not, I will disclose against you what Samuel said: There are two families in Nehardea, one called The House of Jonah [dove] and the other, The House of 'Urbathi [raven-like]; and the sign thereof is, The unclean is unclean and the clean clean.'<span class="x" onmousemove="('comment',' The dove is a clean bird (i.e., fit for food) ; the raven is unclean. The House of Jonah is of pure descent; the other is not. Descendants of the two families were probably widespread in Nehardea, but their origin was forgotten: hence the threat.');"><sup>11</sup></span> Thereupon they threw away the stones out of their hands, which created a stoppage in the royal canal.<span class="x" onmousemove="('comment',' So many were there.');"><sup>12</sup></span> [At that time] Rab Judah announced in Pumbeditha: Adda and Jonathan are slaves; Judah B'Papa is mamzer: Bati B'Tobiah in his arrogance refused to accept a deed of manumission.