Reference for Chullin 36:12

מאן אמרה יוסף בר חייא יוסף בר חייא מכולי עלמא גמיר

Hiyya] heard of this he was annoyed and said: 'What! I take my traditions from every one! Indeed, I received my traditions from Rab Judah who recited in his statements of tradition even the doubt as to his authorities.

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