Parashas Eikev · Passuk 11:11
but the land you are about to cross into and possess, a land of hills and valleys, soaks up its water from the rains of heaven.
Torah Temimah points to Taanis 9b.
TT lemma: למטר השמים (unit 1 of 2).
English: It was taught: R’ Yehoshua says: The whole world drinks from the upper waters, as it is said, “from the rain of the heavens it drinks water.” R’ Eliezer holds that it drinks from the waters of the ocean, as it is said, “a mist rose from the earth and watered it.”
Dispute (R’ Yehoshua / R’ Eliezer — source of the world’s water)
Whether rain is primarily from above or from oceanic mist is a tannaitic dispute; this verse is central for R’ Yehoshua.