"When Elijah the prophet set out to discredit the false prophets of the idol Baal, he built an altar on Mount Carmel and sacrificed an ox there. The Talmud points out that after the First Temple was built sacrifice was forbidden any place but there. Elijah's altar would normally have been forbidden, then. However, as the sages taught, if we know someone to be a prophet of impeccable sanctity and piety, that person even may suspend one of the Torah's laws temporarily (except the one forbidding idol worship) for the purpose of sanctifying God's name.
Does anyone know what the source of this idea is? Seems like a great way to justify a free-for-all.