From: Rabbi Akiva Eiger
To: Unknown recipient
Rabbi Akiva Eiger clarifies that his earlier question about how the Torah-mandated oath of bailees can ever apply given the bailee's migo was not a genuine difficulty but a springboard for a comprehensive pilpul for his yeshiva students. He maps the Sma–Shach dispute regarding the biblical or rabbinic status of a migo-based oath onto the earlier Rishonim dispute between Rabbeinu Tam and the Rivah, connecting sugyos across multiple tractates into a unified analytical framework.
Source: Shu"t Rabbi Akiva Eiger §175