וַהֲבִיאוֹתִ֞ים אֶל־הַ֣ר קׇדְשִׁ֗י וְשִׂמַּחְתִּים֙ בְּבֵ֣ית תְּפִלָּתִ֔י עוֹלֹתֵיהֶ֧ם וְזִבְחֵיהֶ֛ם לְרָצ֖וֹן עַֽל־מִזְבְּחִ֑י כִּ֣י בֵיתִ֔י בֵּית־תְּפִלָּ֥ה יִקָּרֵ֖א לְכׇל־הָעַמִּֽים׃
I will bring them to My sacred mountain and cause them rejoice in My house of prayer. Their burnt offerings and sacrifices shall be welcome on My altar; For My House shall be called a house of prayer for all peoples.” [Yeshayahu 56-7]
Hashem will welcome our korbanos on His Mizbeach. WHY? כי" ביתי בית תפלה יקרא לכל העמים" - B/c the Beis Hamikdash is a Beis Tfillah for all the nations.
How does that follow? What is the "כי"?
