📖 Biblical Definition
The Sanctus (Latin "holy") is the threefold "Holy, Holy, Holy" sung by the seraphim around the throne in Isaiah’s vision: "And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory" (Isaiah 6:3). The same chant is heard from the four living creatures around the throne in Revelation 4:8: "Holy, holy, holy, Lord God Almighty, which was, and is, and is to come." The historic eucharistic liturgy incorporates it as the congregation’s response to the prefatory dialogue — joining the church on earth with the worship of heaven. To sing the Sanctus is to add our voice to the seraphim and elders who have not stopped for two thousand years.
📜 Webster 1828 Definition
The threefold ‘Holy, Holy, Holy’ of Isaiah 6:3 and Revelation 4:8; the church's shared song with heaven's worship.
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Latin: Sanctus, Sanctus, Sanctus, Dominus Deus Sabaoth — Holy, Holy, Holy, Lord God of Hosts.
Followed in many liturgies by Pleni sunt caeli et terra gloria tua (Heaven and earth are full of Thy glory) and Hosanna in excelsis (Hosanna in the highest), drawing in Psalm 118 / Mt 21's palm-Sunday acclamation.
📖 Key Scripture
Isaiah 6:3 — "Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory."
Revelation 4:8 — "Holy, holy, holy, Lord God Almighty, which was, and is, and is to come."
Psalm 99:9 — "Exalt the LORD our God, and worship at his holy hill; for the LORD our God is holy."
Psalm 118:26 — "Blessed be he that cometh in the name of the LORD."
⚠️ Modern Corruption
Modern worship rarely sings the Sanctus; the church on earth misses out on its weekly chorus with the church above.
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Some Protestant subcultures avoid the Sanctus as "too Catholic," dropping a hymn that is straight from Isaiah 6 and Revelation 4. The corruption is rejecting biblical worship-vocabulary because of associations rather than because of content.
🔗 Greek & Hebrew Roots
Latin Sanctus (holy), Hebrew qadosh, Greek hagios.
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Hebrew qadosh — holy; threefold in Isaiah 6:3.
Greek hagios — holy; threefold in Revelation 4:8.
Usage
"Singing the Sanctus joins the worship that has never stopped."
"The household teaches its children the song they will sing forever."
"Holy, Holy, Holy — the central confession of God's being."