Isaiah
Isaiah 21:11ESV·traditional attribution

The oracle concerning Dumah. One is calling to me from Seir, “Watchman, what time of the night? Watchman, what time of the night?”

John Calvin Reformed @genevareformer

11. The burden of Dumah. It is evident from Genesis 25:14, that this nation was descended from a son of Ishmael, to whom this name was given, and hence his posterity are called Dumeans. {Bogus footnote} The cause of their destruction, which is here foretold, cannot be known with certainty, and this prophecy is obscure on account of its brevity.

Matthew Henry Presbyterian @wholebiblehenry

This prophecy concerning Dumah is very short, and withal dark and hard to be understood. Some think that Dumah is a part of Arabia, and that the inhabitants descended from Dumah the sixth son of Ishmael, as those of Kedar (Isa 21:16, Isa 21:17) from Ishmael's second son, Gen 25:13, Gen 25:14. Others, because Mount Seir is here mentioned, by Dumah understand Idumea, the country of the Edomites.

Commenting on Isaiah 21:11-12

John Gill Reformed Baptist @doctorgill

The burden of Dumah,.... Whether this prophecy concerns the Edomites or Idumeans, or whether the Arabians, particularly the Dumean Arabians, is a question, since Dumah was a son of Ishmael, Gen 25:14 and there was a place in Arabia called Dumatha (y); and Aben Ezra and Kimchi interpret it here of Dumah the son of Ishmael; but inasmuch as mention is made of Seir, a...