Reference for Ketubot 211:3

ועבד תיבותא ויתיב קמיה עד דאפיק ליה סידריה והיינו דאמרי סדר דאליהו רבה סדר אליהו זוטא

Thereupon he made a box [for himself] and he sat in front of it, until he concluded his Order with him. And this is [the reason] why people speak of the Seder Eliyahu Rabbah and the Seder Eliyahu Zuta.

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