KJV:
And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.
NKJV:
And one cried to another and said: "Holy, holy, holy is the LORD of hosts; the whole earth is full of His glory!"
NIV:
And they were calling to one another: "Holy, holy, holy is the LORD Almighty; the whole earth is full of his glory."
Interpretation:
Angelic beings proclaim God's holiness and glory continuously. His glory fills the entire earth, not just heaven. The threefold repetition of "holy" emphasizes God's complete purity and separation from sin. Isaiah's vision reveals that all creation already contains and displays God's magnificent glory.