Reference for Avodah Zarah 3:3

מאן דתני אידיהן לא משתבש דכתיב (דברים לב, לה) כי קרוב יום אידם ומאן דתני עידיהן לא משתבש דכתיב (ישעיהו מג, ט) יתנו עידיהם ויצדקו

The one who taught edehem (with an aleph) is not in error, as it is written: “For the day of their calamity is at hand” (Deuteronomy 32:35); And the one who taught edehem (with an ayin) is not in error, as it is written: “Let them bring their witnesses [testimonies] that they may be justified” (Isaiah 43:9).

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