Adam Clarke on Genesis 25:14

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. משמע mishma signifies Hearing; דומה dumah, Silence; and משא massa, Patience. Hence, "Hear much, say little, and bear much," tantamount to the famous maxim of the Stoics, Ανεχου και απεχου, "Sustain and abstain," is supposed to be the spirit of the original words.