Based on the transcript by Adrian Azzopardi in a comment on the original YouTube page

We all know what the rabbis say is the origin of Judaism.

Moshe [Moses]  passed the Torah down to the elders. The elders passed the Torah down to the prophets. And so all the way down to the Talmud. And there were no changes.

The central motif of the Jewish understanding of history is that there were no changes in the religion. In other words, what the rabbis are saying now are merely minor refinements of what the rabbis had said during the time of the Elders – the time of the Mishnah and the Talmud.

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