The Rambam says in Hilchos Malachim 12:2:

There are some Sages who say that Elijah's coming will precede the coming of the Mashiach. All these and similar matters cannot be definitely known by man until they occur for these matters are undefined in the prophets' words and even the wise men have no established tradition regarding these matters except their own interpretation of the verses. Therefore, there is a controversy among them regarding these matters.

Translation from Chabad.org

Two related questions:

1) Where is Eliyahu's arrival debated that you could describe it as "some Sages" and "controversy"? Presumably the Rambam learns from the Bar Kochba events, where Eliyahu Hanavi didn't make an appearance that it is, in fact, uncertain when in the process he will arrive, but is this actually explicitly argued anywhere?

2) In Hilchos Nazir 4:11 the Rambam says that someone who vows that he will be a Nazir on the day "The son of Dovid comes on" is a Nazir from that day forward, unless he makes the vow on Shabbos or Yom Tov. Because there is a Safek if Moshiach can come on those days, his vow only starts the day after (but is effective even on Shabbos and Yom Tov subsequently). What is the doubt about Shabbos and Yom Tov? The Kesef Mishna, the Midgal Oz, the Radbaz, etc. all point to the doubt about whether or not there is "Techumin" above. If there is, then Eliyahu HaNavi can't come on Shabbos and Yom Tov, so Moshiach can't come that day.

So from this we see clearly that Eliyahu HaNavi is an integral part of Moshaich's arrival and not subject a matter for which there is no clear tradition.

So which is it? How exactly does the Rambam understand Eliyahu HaNavi's timing in the arrival of Moshiach?

  • Couldn't if Eliyahu must come before just be part of the Safek? He's not a Nazir on Shabbat bc Eliyahu might have to come first and he may be unable bc of vertical Techum (whatever that means).
    – Double AA
    Nov 29, 2015 at 20:17
  • @DoubleAA If Eliyahu's arrival is itself a Sofek, then you would have a Sfek Sfeika If Eliyahu doesn't need to come, then he is a Nazir on Shabbos, and if he does, maybe there isn't Techumin above, and he is a Nazir. Do we say Sfek Sfeika LeHakel by a Nazir? If we do, then that would be an answer, but I'd be surprised.
    – Yishai
    Nov 29, 2015 at 20:29
  • @Yishai: A very artful question which if answered honestly will precipitate a firestorm of negative comments. Do you really want "someone" to offer an answer? The debate is more related to what the meaning of "the coming of Moshiach" is, not if Eliyahu will come. And your reference about the Shabbat 'techumin' is dealing with the subject of resurrection, whether the resurrected will be obligated in the mitzvot, and if the first 15 to be resurrected are in the category of 'dead' at all or if they are released from their obligation to keep the mitzvot. Dec 1, 2015 at 14:56
  • 1
    @YaacovDeane, I think a sourced or well argued and tightly sourced answer wouldn't cause a firestorm. Assertions made that go against the community's preconceptions would. I would encourage answers of the former type.
    – Yishai
    Dec 3, 2015 at 0:16
  • Here is one approach to the debate: sie.org/2313089
    – Lee
    Jul 26, 2017 at 7:34


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