Let all mortal flesh keep silent and in fear and trembling stand, pondering nothing earthly-minded. For the King of Kings and the Lord of Lords comes to be slain, to give himself as food to the faithful. Before him go the ranks of angels: all the principalities and powers, the many-eyed cherubim and the six-winged seraphim, covering their faces, singing the hymn: Alleluia! Alleluia! Alleluia!
-Divine Liturgy of St. Basil, Great and Holy Saturday***
***Note: This ancient hymn is also chanted during the Divine Liturgy of St. James, and during the Divine Liturgy at the Consecration of a Church. However, it is perfectly suited to be chanted on Great and Holy Saturday (see here for more info).