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: It also echoes Revelation 4:8 and Matthew 21:9 , specifically the "Hosanna" and "Benedictus" ("Blessed is he who comes in the name of the Lord") shouted during Jesus’ entry into Jerusalem.

In the , the Sanctus is positioned at the conclusion of the Preface and immediately before the Eucharistic Prayer . Theologically, this "thrice-repeated" acclamation emphasizes God's absolute purity and transcendence. Historical Development Learn the Sanctus | FREE Latin Learning Guide Sanctus Dominus

: The first part is drawn from Isaiah 6:3 , where seraphim (six-winged angels) cry these words while surrounding God's throne. : It also echoes Revelation 4:8 and Matthew