Mishma, Dumah, Massa,
Immediately after the account of Abraham's death, Moses begins the story of Isaac (Gen 25:11), and tells us where he dwelt and how remarkably God blessed him. Note, The blessing of Abraham did not die with him, but survived to all the children of the promise.
Commenting on Genesis 25:11-18
And Mishma, and Dumah, and Massa. Of Mishma and Massa, and of their posterity, there is not anything said elsewhere, unless the Masani, Ptolemy (p) places near Arabia Felix, came from Massa. Dumah seems to be the same Isaiah speaks of in Gen 21:11; and in Arabia Deserta, where some of Ishmael's posterity settled, is a place called Dumaetha, by Ptolemy (q), which perhaps had...
Mishma, and Dumah, and Massa - Where the first and last of these settled is not known; but it is probable that Dumah gave his name to a place called Dumah in Arabia. See a prophecy concerning this place, Isa 21:11 (note), from which we find that it was in the vicinity of Mount Seir. These three names have passed into a proverb among the Hebrews, because of their signification.