And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.

Wesley's Notes

66:23 And, and c. - In the gospel - church there shall be as constant and settled a course of worship (though of another nature) as ever was in the Jewish church: Christians are not bound to keep the Jewish sabbaths or new - moons. But New Testament worship is expressed by Old Testament phrases. The Jews were only obliged to appear three times in a year at Jerusalem, but (saith the prophet) the gospel - church shall worship God from one sabbath to another.

King James Translators' Notes

from one new...: Heb. from new moon to his new moon, and from sabbath to his sabbath

Jamieson-Fausset-Brown Bible Commentary

23. Literally, "As often as the new moon (shall be) in its own new moon," that is, every month (Zec 14:16).

sabbath-which is therefore perpetually obligatory on earth.

all flesh-(Ps 65:2; 72:11).

before me-at Jerusalem (Jer 3:16, 17).

Matthew Henry's Concise Commentary

66:19,20, set forth the abundance of means for conversion of sinners. These expressions are figurative, and express the plentiful and gracious helps for bringing God's elect home to Christ. All shall be welcome; and nothing shall be wanting for their assistance and encouragement. A gospel ministry shall be set up in the church; they would have solemn worship before the Lord. In the last verse the nature of the punishment of sinners in the world to come is represented. Then shall the righteous and wicked be separated. Our Saviour applies this to the everlasting misery and torment of impenitent sinners in the future state. To the honour of that free grace which thus distinguishes them, let the redeemed of the Lord, with humility, and not without holy trembling, sing triumphant songs. With this affecting representation of the opposite states of the righteous and wicked, characters which include the whole human race, Isaiah concludes his prophecies. May God grant, for Christ's sake, that our portion may be with those who fear and love his name, who cleave to his truths, and persevere in every good work, looking to receive from the Lord Jesus Christ the gracious invitation, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world.