Jeremiah 49:21

“The earth is moved at the noise of their fall, etc.] Of the Edomites; whose fall was from the height of greatness and glory to a very low condition indeed; and as things, the higher they are from whence they fall, the greater noise they make, so it was with the Edomites; perhaps there may be some allusion to the falling of rocks and hills, with which Edom, abounded: this may respect either the noise and shout of the conquerors, when they fell; or the cry of the Edomites, when taken and destroyed; or the report of their destruction, when it came into the world; which struck the inhabitants of the whole earth with terror and amazement, so that they trembled at it; an hyperbolical expression,…”

“was heard in--that is, shall be heard at. Red Sea--a considerable distance from Idumea; though the district at the Elantic bay of the Red Sea originally belonged to Idumea, and the sea itself was called from Edom, that is, "red" (Gen 25:30, Margin). Others translate, "the weedy sea" (Margin), and derive the name, "Red Sea," from its red weeds; the former view is preferable.”

“Edom stretched along the south of Judah from the border of Moab on the Dead Sea to the Mediterranean and the Arabian deserts, and held the same relation to Judah which Moab held toward the kingdom of Israel. Although expressly reserved from attack by Moses Deuteronomy 2:5, a long feud caused the Edomites to cherish so bitter an enmity against Judah, that they exulted with cruel joy over the capture of Jerusalem by the Chaldaeans, and showed great cruelty toward those why fled to them for refuge. Of the prophecies against Edom the first eight verses of Obadiah are also found in Jeremiah (see the marginal references). As Jeremiah wrote before the capture of Jerusalem, and Obadiah apparently…”

“earth: Jer 50:46; Isa 14:4-15; Eze 26:15-18, Eze 21:16, Eze 32:10; Rev 18:10 Red sea: Heb. Weedy sea Jeremiah 49:22”