עַ֤ל הַר־גָּבֹ֙הַּ֙ וְנִשָּׂ֔א שַׂ֖מְתְּ מִשְׁכָּבֵ֑ךְ גַּם־שָׁ֥ם עָלִ֖ית לִזְבֹּ֥חַ זָֽבַח׃
你在高聳的山上安設你的床；你也上到那裡去獻祭。
Rabbeinu Bahya
Some Kabbalists understand the expression בכל ביתי as a reference to the ב in בראשית, i.e. the house of prayer, such as in ושמחתים בבית תפלתי, “I will make them rejoice in the House of My prayer,” (Isaiah 57,7) The meaning of the word תפלתי in that verse is similar to כי ביתי בית תפלה יקרא, ”for my House is known as a House of prayer” (same verse). This is what Hillel had in mind when he said: “G’d meant that “if you come to My house, I will come to your house.”