Eliyahu HaNavi Zachur La’Tov

Often, the Gemara faces a halachic question that it can’t resolve. In that situation, the Gemara declares, “Tayku!” The simplest explanation of that word is that the question should stand. The Tosfos Yom Tov offers a variant explanation which has become very popular. He suggests that Tayku is an acronym for Tishbi Yetaretz Kushyos V’Abayos – Eliyahu HaTishbi will answer these unresolved questions when Moshiach comes speedily in our days.
Fascinatingly, the Gemara (Bava Metzia 114b) records an incident where Rabba Bar Avuha asked Eliyahu HaNavi a question, and Tosfos says we do not follow his answer! Tosfos then enumerates other halachic rulings of Eliyahu that we do not follow. Tosfos wonders at this. Indeed, one could suggest that “Lo baShamayim hi,” and we should not follow Eliyahu HaNavi’s rulings at all. Tosfos does not entertain this possibility. The Chasam Sofer suggests that when Eliyah HaNavi takes an angelic form such as his appearance at a bris milah, we would not follow his rulings. However, in Bava Metzia and elsewhere, where Eliyahu took a corporeal form, he is to be treated as an eminent sage, and we would follow his rulings just as we would a living Torah scholar.