Rab Itai said to Rav Asi. Rab Itai said: "I see that he was in the time of Rav Ashi, and thus they are two." [And later at the end of section Aleph, it is written in the genealogies that Rab Itai said in the name of Rav, and another version states Rab Itai before Rav in the chapter of disqualified offerings, and I have not seen anyone except in the Jerusalem Talmud, chapter 2 of Bekhorot, where Rabbi Yochanan said: "Is this not so, Alfan, Rabbi Itai?"]
Seder_HaDorot,_Tanaim_and_Amoraim.463:1