Midrash su Salmi 68:4

The Holy One, blessed be He, created seven firmaments, and He selected from them all 'Araboth only for the place of the throne of glory of His kingdom, as it is said, "Cast up a highway for him that rideth on the 'Araboth, with Jah, his name" (Ps. 68:5). The Holy One, blessed be He, created seven lands, and He chose from all of them the land of Israel only, as it is said, "A land… the eyes of the Lord thy God are always upon it, from the beginning of the year even unto the end of the year" (Deut. 11:12). Another verse says, "I said, I shall not see the Lord, even the Lord in the land of the living" (Isa. 38:11). The Holy One, blessed be He, created seven deserts, and of them all He chose the desert of Sinai only to give therein the Torah, as it is said, "The mountain which God hath desired for his abode" (Ps. 68:16).