Cried — Singing in consort. Holy — This is repeated thrice, to intimate the Trinity of persons united in the Divine essence. Glory — Of the effects and demonstrations of his glorious holiness, as well as of his power, wisdom, and goodness.
Related Commentaries of Isaiah 6:3
Isaiah 6:3
3 And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.