Rabbi Hoshaya [when he came from Nehardea, in Bechorot (17a), in the first chapter of Shabbat (19b), and in the chapter of Chavit (135b), Rabbi Yosef said: "A greater man has come to inform us." Abaye replied to him: "It is much that he teaches us." When Ravin came, he said: "There was an incident in Usha in the courtyard of Rabbi Hoshaya. They came and asked Rabbi Asi" (Berakhot 3:3)].
Seder_HaDorot,_Tanaim_and_Amoraim.275:1