Excerpt - Apocalyptic Commentary of the Book of Isaiah by Avraham Gileadi, Ph.D.

6:3 They called out to one another, and said, Most holy is Jehovah of Hosts; the consummation of all the earth is his glory!

The Hebrew superlative “most holy” or “thrice holy” (qados, qados, qados) reflects the highest of Isaiah’s spiritual levels—Jehovah’s. Emulating Jehovah are those in Isaiah’s seraph and son/servant categories, who are also called “holy” (qados) (Isaiah 13:3; 52:10). The seraphs’ anthem—“The consummation of all the earth is his glory!” (melo’ kol-ha’ares kebodo)—identifies the purpose of the earth’s creation as Jehovah’s “glory.” In other words, Jehovah is glorified by bringing the earth to its “consummation,” its purpose being fulfilled when it begets “holy ones” like him (Isaiah 4:3; 62:12).

6:4 The threshold shook to its foundation at the sound of those who called and a mist filled the temple.

The threshold of the Holy of Holies’ shaking to its foundation at the seraphs’ cosmic hymn reflects the power of persons in the seraph category over the elements. Moses demonstrated that power when he smote the land of Egypt with plagues, divided the Red Sea, and brought forth water out of the earth (Exodus 9:22–25; 10:12–15; 14:16–28; 17:6). Similarly, Elijah multiplied the widow’s flour and oil, raised her child from the dead, and withheld the rain or returned it again (1 Kings 17:1–24; 18:42–45). The “mist” or cloud of glory that fills the temple attests to Jehovah’s manifesting his presence.

See more here and here
Buy the book