בבא מציעא דף נט/ב מאי לא בשמים היא אמר רבי ירמיה שכבר נתנה תורה מהר סיני אין אנו משגיחין בבת קול שכבר כתבת בהר סיני בתורה אחרי רבים להטות
T.T. This means that a Voice from Heaven, is only considered like one opinion against a group, and we decide the law according to the majority. One should know that prophecy is also included in this concept of items that are from Heaven. Thus, Rambam states that a Prophet can not attempt to change what is written in the Torah. And, even if one says that we decide according to an individual’s opinion, then he would be considered an untrue prophet. Please understand that only regards to legal decisions, do we not listen to a prophet. However, to make clear an actual situation, we do listen to a prophecy.
TORAH IS FOR US
מסכת תמורה דף טז/א אמר רב יהודה אמר שמואל שלשת אלפים הלכות נשתכחו בימי אבלו של משה אמרו לו ליהושע שאל א"ל לֹּא בַש ָׂמַיִם הִוא (דברים פרק ל, יב )
T.T. The Jews asked Yehoshua to request the forgotten laws from Heaven, like Moshe did. Yehoshua answered that the Torah was no longer in the Heavens, but the Jews would have to derive the forgotten laws from the revealed Torah. Thus, we cannot act like Moshe, since the whole Torah was revealed to Moshe from Heaven.
ITEMS FOR FURTHER STUDY:
ל, ג שבכל מקום שגלו, שכינה עמה ם כט, י נתינים
