Esias 30:29

29 Must ye always rejoice, and go into my holy places continually, as they that keep a feast? and must ye go with a pipe, as those that rejoice, into the mountain of the Lord, to the God of Israel?

Esias 30:29 In-Context

27 Behold, the name of the Lord comes after a time, burning wrath: the word of his lips is with glory, a word full of anger, and the anger of his wrath shall devour as fire.
28 And his breath, as rushing water in a valley, shall reach as far as the neck, and be divided, to confound the nations for vain error: error also shall pursue them, and overtake them.
29 Must ye always rejoice, and go into my holy places continually, as they that keep a feast? and must ye go with a pipe, as those that rejoice, into the mountain of the Lord, to the God of Israel?
30 And the Lord shall make his glorious voice to be heard, and the wrath of his arm, to make a display with wrath and anger and devouring flame: he shall lighten terribly, and as water and violent hail.
31 For by the voice of the Lord the Assyrians shall be overcome, by the stroke wherewith he shall smite them.

The Brenton translation of the Septuagint is in the public domain.