Deuteronómio 12:13 Halajá: Mishneh Torah, Foundations, Mishneh Torah, Negative Mitzvot & Sefer HaChinukh

Likewise, a prophet who violates his own words, or who witholds his prophecy forfeits his life to Heaven, and of the three it is said: "I will require it of him" (Ibid.). Moreover, should a prophet, who is known to us as a prophet, charge us to violate one of all the commandments spoken of in the Torah, or many commandments, whether minor or major, it is mandatory to hearken unto him, if it be a need of the time. Thus did we learn traditionally from the early sages: "In all matters, if the prophet tell thee to forego the words of the Torah, even as Elijah on Mount Carmel did, hearken unto him, save only in idolatry".³Yebamot, 90; Sifre, Deut. 18. C. Provided, however, that the violation be temporary as, for example, Elijah on Mount Carmel, who sacrificed a burnt-offering without, whereas Jerusalem was chosen the only place therefor, and whosoever sacrifices without is guilty and suffers excision. And, because he is a prophet, it is mandatory to hearken unto him, for even in this it is said: "Unto him ye shall hearken" (Deut. 18.15). Had they at that time asked Elijah, and said unto him: How can we abolish that which it is written in the Torah: "Take heed to thyself that thou offer not thy burnt-offerings in every place that thou seest" (Ibid. 12.13)? He would have replied: "This is not spoken of save against the one who sacrifices without continuously who is guilty and suffers excision, even as Moses hath commanded; but I am sacrificing this day without, because God wills it, so as to deny the prophets of Baal." In such manner, if all the prophets command to violate aught temporary, it is mandatory to hearken to them; but if they say that the matter be abolished forever, the one saying so is punished with death by strangulation, for the Torah said: "Unto us and to our children forever" (Ibid. 29.28).

That the breastplate shall not be loosened from the ephod, as it is said, “That the breastplate be not loosed from the ephod” (Ex. 28:28).

Not to offer up sacrifices outside (the Sanctuary), as it is said, “Take heed to thyself that thou offer not thy burnt-offerings (in any place)” (Deut. 12:13).