Ellicott's Commentary for English Readers - Isaiah 12:4
(4) Declare his doings among the people.—Literally, among the peoples. The prophet quotes from the hymn which had been sung when the Ark was placed in Zion (1 Chronicles 16:8), and in part from Psalms 105:1. read more
Ellicott's Commentary for English Readers - Isaiah 12:3
(3) Therefore with joy shall ye draw water . . .—Literally, And with joy. The words may be either part of the hymn, or addressed to those who are to join in it. The latter seems most in harmony with the context. In the later ritual of the Feast of Tabernacles, the priests went in solemn procession to the Pool of Siloam, filled a golden vase with water, carried it to the Temple, and poured it out on the western side of the altar of burnt offering, while the people chanted the great Hallel (Hymn... read more