The Arabians and Dedanims are here brought in for a portion of the calamities now hanging over the countries to be made desolate. It is probable, that the latter were the descendants of Dedan, a son of Abraham, whom Keturah bare him, Genesis 25:3. And as to Kedar, so often spoken of in the word of God, we are not at a loss to trace the origin to Ishmael. The church in her song, speaks of her corruptions by nature, under the figure of the blackness of Kedar while rejoicing in her comeliness, from the comeliness put upon her, by her Solomon, the Lord Jesus Christ; Song of Solomon 1:5. All these burdens carry with them the same divine signature, that they are not of the prophet's own mind, but come from the Lord; and are therefore sure and certain.
Related Commentaries of Isaiah 21:13
Isaiah 21:13-17
13 The burden upon Arabia. In the forest in Arabia shall ye lodge, O ye travelling companies of Dedanim.
14 The inhabitants of the land of Tema broughtd water to him that was thirsty, they prevented with their bread him that fled.
15 For they fled from the swords,e from the drawn sword, and from the bent bow, and from the grievousness of war.
16 For thus hath the Lord said unto me, Within a year, according to the years of an hireling, and all the glory of Kedar shall fail:
17 And the residue of the number of archers,f the mighty men of the children of Kedar, shall be diminished: for the LORD God of Israel hath spoken it.