The earliest source I found is the Ramban who says in Pesachim 7b:
ועוד נ"ל שסדר ברכות הללו של שחרית ברכות שבח הן על נוהג העולם ואפי' לא שמע שכוי מברך עליו וכן בכולן, וכן נהגו ומנהג ישראל תורה היא
Is this the source of the expression? Are there any earlier sources?
Answer
According to R. Dr. Haym Soloveitchik the term "minhag avoteinu Torah" or "minhag Torah hi" was likely coined by Rabbenu Yitschak ben Yehuda, a student of Rabbenu Gershom, and the rebbi of Rashi. He is certainly the first known Ashkenazi to use the term. [2]
[2] Minhag Ashkenaz ha-Kadmon. Published in Collected Essays II page 49.
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