Halachic discussions in the Gemoro can end with the word תיקו. According to one view in Hebrew Wikpedia it stands for

תשבי יתרץ קושיות ובעיות. שמשמעותן: השאלה תעמוד ותוכרע רק כאשר יבוא התשבי -אליהו הנביא

The question will be answered when Eliyohu comes.

The Gemoro in Shabbos 108a records a question asked of Rav Nachman bar Yitzchok whether tefillin cane be written on the skin of a fish. Rav Nachman answers

אם יבא אליהו ויאמר When Eliyohu comes, he will tell us.

The Gemoro asks what this last statement means and Rashi comments

היתר ואיסור אין תלוי בו דלא בשמים היא

(We do not rely on Eliyohu to teach us whether something is) permitted or forbidden. It does not depend on him because the Torah is not in heaven.

How does Rashi's comment fit with the understanding of תיקו referred to above?

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    The real answer is that תיקו doesn't mean that. It means it will stand and that is it. – Moshe Steinberg Jul 12 '16 at 17:23
  • (If we accept that that's what teku means...) It sounds like Rashi is explaining this question of the g'mara; maybe that understanding of teku is according to R. Nachman bar Yitzchak? (Disclaimer: I haven't looked up the g'mara. Or Wikipedia (l'havdil).) – msh210 Jul 12 '16 at 17:44
  • In Dine Mamonot you find יהא מונח עד שיבא אליה In Kiddushin also about Yochasim. – kouty Jul 12 '16 at 19:55
  • If someone has a masoret for a psak we do not say it Lo bashamayim, Eliahu is Pinechass, he received a big masoret. So numerous doubts will be resolved by masoret through Eliahou – kouty Jul 12 '16 at 20:13

Rashi is commenting if Eliyahu would come and give a answer then. At that point היתר ואיסור אין תלוי בו דלא בשמים היא. When Moshiach comes then Eliyahu will be back on this world, and then his Psak will be accepted.

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    +1. This approach could reconcile Rashi with the Mabit (Sha'ar HaY'sodos §60). The Mabit explains that, among the righteous leaders of the past, only Eliyahu will be able to give halachic rulings in the future because he retained an uninterrupted aspect of physicality and a tether to 'Olam HaZeh throughout the generations. However, any other righteous person who will have to be resurrected will not be able to rule. – Fred Jul 12 '16 at 19:39

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