For this is what the Lord says to me: “Within one year, as a hired worker would count it, all the glory of Kedar will be gone.
16. For thus hath the Lord said to me. He adds that this defeat of the Arabians, of which he prophesied, is close at hand; which tended greatly to comfort the godly. We are naturally fiery, and do not willingly allow the object of our desire to be delayed; and the Lord takes into account our weakness in this respect, when he says that he hastens his work.
Arabia was a large country, that lay eastward and southward of the land of Canaan. Much of it was possessed by the posterity of Abraham. The Dedanim, here mentioned (Isa 21:13), descended from Dedan, Abraham's son by Keturah; the inhabitants of Tema and Kedar descended from Ishmael, Gen 25:3, Gen 25:13, Gen 25:15.
Commenting on Isaiah 21:13-17
For thus hath the Lord said unto me,.... The prophet; which confirms what is before said, as well as assures the accomplishment of what follows: within a year, according to the years of an hireling; that is, exactly and precisely, as soon as ever the year is come to an end; for the hireling, when his year is up, instantly demands dismissal from his service, or his wages, or both.