An interesting article appeared on March 21 (2018) concerning an appeal by the “Sanhedrin” to the “Sons of Ishmael” (Arab Muslims) to help build the Third Temple (excerpts below):
“This move is far more than symbolic. It is intended to bring the entire world one step closer to the global peace that will characterize the Messianic era.
“I will bring them to My sacred mount And let them rejoice in My house of prayer. Their burnt offerings and sacrifices Shall be welcome on My mizbayach; For My House shall be called A house of prayer for all peoples.” Isaiah 56:7
The rabbi explained that should the quoted Rabbi Elijah ben Solomon Zalman, a foremost Jewish authority from the 18th century known as the “Vilna Gaon.”
“If a single sacrifice is brought in the Third Temple,” Rabbi Shtern said, quoting the Vilna Gaon. “The shofar announcing the Messiah will already start to blow.”
Of course the “Sanhedrin” is affiliated with the Temple Mount Institute and is a minority fundamentalist group. The Israeli government does not promote such views neither do many religious Jews. However, these developments and undercurrents are interesting and the Rabbi’s are correct – if they ever manage to build the third temple and commence sacrifice (especially together with Muslims) – the trumpet (Shofar) will announce the Messiah…..because it will be the Last Trump.
“And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign forever and ever” (Rev.11.15).
Such a structure would be an abomination to God and not a house of prayer.
 Sanhedrin Calls on Arabs to Take Their Role in Third Temple as Prophesized by Isaiah
Read more at https://www.breakingisraelnews.com/104480/sanhedrin-calls-on-arabs-to-take-their-role-in-third-temple-as-prophesized-by-isaiah/#rrYeJB4MoeKlt291.99