Isaiah
Isaiah 21:16ESV·traditional attribution

For thus the Lord said to me, “Within a year, according to the years of a hired worker, all the glory of Kedar will come to an end.

John Calvin Reformed @genevareformer

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.

Matthew Henry Presbyterian @wholebiblehenry

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

John Gill Reformed Baptist @doctorgill

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.