Reference for Avodah Zarah 62:7

רב פפא מפיקין ליה לאבבא דחנותא ושתי רב אחאי מייתו ליה לביתיה ושתי ותרוייהו משום חתנות רב אחאי עביד הרחקה יתירתא

R. Papa used to drink beer when it was brought out to him to the door of the shop; R. Ahai used to drink it when it was brought to his house. Both of them held that the reason [for the prohibition] is intermarriage. R. Ahai was extra precautious.

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