Kedar was the son of Ishmael, and as the son of the bond-woman mocked, so his posterity. All must be accounted for therefore in the day of judgment.
Related Commentaries of Jeremiah 49:28
Jeremiah 49:28-29
28 Concerning Kedar, and concerning the kingdoms of Hazor, which Nebuchadrezzar king of Babylon shall smite, thus saith the LORD; Arise ye, go up to Kedar, and spoil the men of the east.
29 Their tents and their flocks shall they take away: they shall take to themselves their curtains, and all their vessels, and their camels; and they shall cry unto them, Fear is on every side.