Eliyahu bringing a korban to Hashem at Har HaCarmel is a classic example of horaas shaah, a case where a navi temporarily suspends the halachik system. Rashi (Devarim 12:13) seems to imply differently - that Eliyahu was using a built in exception to the prohibition of bringing a korban outside of the mikdash. This episode addresses this apparent contradiction. It also discusses a contradictory Rashi in Devarim 18:22 and the Rambam in the ninth perek of Yesodei Hatorah.
