Isaiah 30:29

Ye shall have a song... — The “holy solemnity,” or feast, was probably the Feast of Tabernacles, the feast of in-gathering, of all the festivals of the Jewish year the most abounding in its joy. In later times, and probably, therefore, in earlier, it had a night-ritual of special solemnity, the court of the Temple being illuminated with a great candelabrum. It was known as being pre-eminently “the feast” (1 Kings 8:2; 1 Kings 8:65; 1 Kings 12:32; Ezekiel 45:25; 2 Chronicles 7:8). The second clause of the verse completes the picture, by introducing the day-ritual of the procession of pilgrims from the country, bringing their firstfruits and playing on their flutes. (Comp. 1 Samuel 10:5.)

The mighty One of Israel. — Literally, the Rock of Israel, as a name of Jehovah (Isaiah 17:10; Deuteronomy 32:4, et al.).