Charles Ellicott Commentary Isaiah 13:5

"They come from a far country, from the uttermost part of heaven, even Jehovah, and the weapons of his indignation, to destroy the whole land." — Isaiah 13:5 (ASV)

They come from a far country ... —The same phrase is used of Cyrus in Isaiah 46:11, and in Isaiah 39:3 of Babylon itself in relation to Jerusalem. The “end of heaven” represents the thoughts of Isaiah’s time: the earth as an extended plain, and the skies rising like a great vault above. The phrase represents (Deuteronomy 4:32; Psalms 19:6), so to speak, the ultima Thule of discovery. As for “the whole land,” the Hebrew noun hovers, as often elsewhere, between the meanings of “earth,” or “country.” The Septuagint favors the former meaning.