Reference for Moed Katan 7:8

מתקיף לה רב אשי מאן דאמר הלכתא אתיא גזרה שוה עקרה הלכתא ומאן דאמר קרא אתיא גזרה שוה עקרה קרא

come and eradicate a halachah [-usage]; and [likewise] on the view that it is [based on] a Biblical text, can a gezerah shawah<span class="x" onmousemove="('comment',' Gezerah shawah (V. Glos.) which some admit and others do not.');">⁸</span> come and eradicate a text! - But no, said R'Ashi, Rabban Gamaliel and his Beth din concurred with R'Ishmael who held that [the presabbatical restrictions] were based on a halachah-usage.

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