Isaiah 6:3
Holy, holy, holy - This hymn performed by the seraphim, divided into two choirs, the one singing responsively to the other, which Gregory Nazian., Carm. 18, very elegantly calls , , , is formed upon the practice of alternate singing, which prevailed in the Jewish Church from the time of Moses, whose ode at the Red Sea was thus performed, (see Exodus 15:20, Exodus 15:21), to that of Ezra, under whom the priests and Levites sung alternately,
"O praise Jehovah, for he is gracious;
For his mercy endureth for ever;"
Ezra 3:11. See De Sac. Poes. Hebr. Prael. xix., at the beginning.
