Isa 6:3

6:3 Holy, holy, holy. A three-fold repetition is the strongest sort of superlative. Nothing is as holy as God. See note 1:4.

Lord of hosts. See note 1:9.

whole earth. This announcement explains the cosmic perspective of the prophet. God is King of the world, and His salvation and judgment extend to all nations (11:4, 9, 12; 42:1, 4, 5; 65:17; 66:1; cf. Luke 2:14).

glory. See note 4:2, “glorious.”