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Trisagion
Holy God, Holy Mighty, Holy Immortal — the ancient doxology connecting Christian worship to the seraphic hymn of Isaiah.
The Trisagion ('thrice-holy') is one of the most ancient and universal liturgical texts: 'Holy God, Holy Mighty, Holy Immortal, have mercy on us.' It is sung three times at every Divine Liturgy. The Trisagion is addressed to the Holy Trinity as a whole in Orthodox interpretation. It connects Christian worship to the seraphic hymn of Isaiah 6:3: 'Holy, holy, holy is the Lord of hosts.'