רב אחא בריה דרב יוסף

Rab Acha, the son of Rav Yosef, said to Rav Chisda, [Chulin (105a) Bava Metzia (Perek 7)] said to Rav Ashi [Yevamot (31b) Menachot (35b)]. And I asked Rav Ashi, and he said: "When you reach the slaughter of sacred items, ask me," as Rashi explains: "I have cut off from you that you are sharp" [Bava Metzia (109b)]. Rav Ashi sat and pondered, etc.

Rav Mordechai said: "Thus said Abimi from the throat of Rava," etc. Rav Acha, the son of Rav Yosef, said to Rav Ashi: "But we say in the name of Rava" [Avodah Zarah (2b)]. Mar Zutra said in the name of Rav Papa [Chulin (43a)]. He was weakened by the illness of Yarkon, and Rav Kahana healed him in the chapter of eight creeping things [(Kiddushin (110b)) and it seems that he is the last Rav Kahana.

Rav Acha, the son of Rav Yosef, intended to say before Rav Yosef. Eruvin (29b).

However, it requires investigation, for since he was in the days of Rav Ashi, how did he speak with Rav Chisda and Rav Yosef, for he must have been great when he spoke with them, and Rav Chisda died before Rava (there), and Rav Ashi was born when Rava died.]