From one new moon to another, and from one sabbath to another. Not that "new moons" and "sabbaths" will continue to be observed, for "new moons" have already lapsed, and "sabbaths" too will lapse when life is one perpetual sabbath passed in the worship of God.
The phrase, used by the prophet is intended to express absolute continuance without an interval. Shall all flesh come to worship before me (comp. Psalms 65:2). The prophet still uses habitual modes of expression, though speaking of a time and circumstances to which they are no longer appropriate.
"The literal meaning," as Dr. Pusey says, "was physically impossible." "All flesh," in all regions of the "new earth," could not worship in one spot, "and so it was plain that Isaiah spoke of a worship other than that at any given place"—of a worship such as that whereof our Lord spoke to the Samaritan woman, "Woman, believe me, the hour cometh, when ye shall neither in this mountain, nor in Jerusalem, worship the Father" (John 4:21).