The Task Of The Neviim

When the mishna in Avos relates the succession of our Mesora, it says משה קיבל תורה מסיני ומסרה ליהושע ויהושע לזקנים וזקנים לנביאים  - Prophets are part of the chain of transmission.

BY GOLLY!

A Navi receives supernatural Divine communication. Neater than cool. Holy. Spiritual. His job is to give mussar and set the Jews on the straight and narrow. But what have the Neviim to do with the transmission of Torah? The guiding principal of the gemara is לא בשמים היא - The Torah is not given over to Divine input. Hashem gave us the Torah at Sinai and from then on it is in our hands [a per the famous-famous-famous story in Bava Metzia 59]. So why are the NEVIIM part of the chain of transmission.

לא בשמים היא.

Thoughts?

לזכות ר' יצחק יונה בן חנה לבריאת איתנה