For the source text click/tap here: Moed Katan 4
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Our Daf tells of Ravina and Rabba Tosefa’a who were walking together on Hol HaMoed and saw someone who was watering his vegetable garden.
Rabba Tosefa’a called on Ravina to place the person under a ban for performing a forbidden activity on Hol HaMoed.
Rabba Tosefa’a was one of the last of the amora’im, and he participated in the editing of the Talmud. Although we find a number of his rulings (9x) in the Gemara, he was one of the last of the amora’im, few of his teachings remain.
From the above story, he was a student of Ravina; after the passing of Mar bar Rav Ashi, he headed the academy in Sura for six years.
We compare and contrast 2 of the greatest historians of the redaction of the Bavli who lived 100 years apart, Rav Isaac Halevi (a student of Volozhin) whose Dorot Rishonim was a classic (although the Chazon Ish told his grandson not to republish the sefer!)
and Prof Dovid Weiss Halivni who discovered the stammaists as a separate final layer of redaction.