[Avodah] division of parshas hashavua

[Litke, Gary]

What is the source for our standard division of chumash into the
specific weekly portions?
Abarbanel says in intro to Sefer Shmos that this comes from Moshe
Rabbeynu mipi HaGvura. [He also says that Sefer Shmos has 12 portions;
presumably he followed minhag Barcelona and divided Mishpatim into two,
with the second beginning at 'Im Kesef Talveh'.]

I have heard from others that it was devised by Ezra/Anshei Knesses
Hagdola, including the precise breaks for each of the seven aliyas.

Does anyone have further source material for this question?
When the trienniel cycle was used did they divide our weekly portions
into three or did they have a different convention?


Thanks, Gedalia



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