I'm trying to understand where the Rabbis in tractate Megillah get their information.
I thought that the way they interpret the five books of Moses was because they already knew all the laws and stories etc. which were taught to them from Moses to Joshua and so on. But for later books, primarily megillas Esther, where do they get their information?
One quick example is Rava in tractate Megillah (12a) who interpreted the words it used "man and man" (Ch.1:8 - אִישׁ וָאִישׁ) to mean that Mordechai and Haman, who are both called "man" elsewhere, were really servants at the feast.
This is just one example of the many "interpretations " found in this tractate and in the Talmud at large.
Besides the five books of Moses, how did these Rabbis know these things?
EDIT Also, I asked my rabbi, and he said that Mordechai and Esther taught the Jewish people everything about the Megillah after they wrote it. Thoughts on this?