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The phrase "Holy, holy, holy" is found in the Bible in the book of Isaiah and the book of Revelation. Here are the verses where it appears:
Isaiah 6:3 (King James Version): "And one cried unto another, and said, Holy, holy, holy, [is] the LORD of hosts: the whole earth [is] full of his glory.'"
Revelation 4:8 (King James Version): "And the four beasts had each of them six wings about [him]; and [they were] full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come.'"
These verses emphasize the awe, reverence, and holiness of God as proclaimed by angelic beings in their worship and praise.