Isaiah 16:13

“This [is] the word that the Lord hath spoken concerning Moab, &c.] That is, this prophecy now delivered out is what comes from the Lord; it is the word of the Lord, and not of man, and so shall certainly come to pass; when this word was spoken follows: since that time; from eternity, as some, and so refer it to the decree of God within himself; or from the time that Moab was in being, or a nation, as others; or from the time that Balak hired Balaam to curse Israel, so Jarchi; or rather from the time that the Lord made known his mind and will, concerning this matter, to the prophet Isaiah: for it should be rendered, “this is that word which the Lord spake concerning Moab then”f327; that is,…”

“since that time--rather, "respecting that time" [HORSLEY]. BARNES translates it, "formerly" in contrast to "but now" (Isa 16:14): heretofore former prophecies (Exo 15:15; Num 21:29) have been given as to Moab, of which Isaiah has given the substance: but now a definite and steady time also is fixed.”

“This is the word - This is the substance of the “former” predictions respecting Moab. This has been the “general course” or sense of the prophecies respecting Moab, during all its history. Since that time - Formerly; from former times. There had been a course of predictions declaring in general that Moab should be destroyed, and the prophet says here that he had expressed their general sense; or that “his” predictions accorded with them all - for they all predicted the complete overthrow of Moab. He now says Isaiah 16:14 that these general prophecies respecting Moab which had been of so long standing were now to be speedily accomplished. The prophecies respecting Moab, foretelling its future…”

“Since - Since the beginning of God's revelation to me concerning Moab, hitherto. Isaiah 16:14”

“since: Isa 44:8 Isaiah 16:14”

“The massa is now brought to a close, and there follows an epilogue which fixes the term of the fulfilment of what is not predicted now for the first time, from the standpoint of the anticipated history. "This is the word which Jehovah spake long ago concerning Moab. And now Jehovah speaketh thus: In three years, like years of a hireling, the glory of Moab is disgraced, together with all the multitude of the great; a remnant is left, contemptibly small, not great at all." The time fixed is the same as in Isa 20:3. Of working time the hirer remits nothing, and the labourer gives nothing in. The statement as to the time, therefore, is intended to be taken exactly: three years, not more, rather…”