2 Chronicles 21:16 Commentary - English Annotations on the Holy Bible by Matthew Poole
The Philistines; a people fully subdued and dispirited; but God now raiseth their spirits and courage to do his work.
Near the Ethiopians, Heb. near the Cushites, i.e. either the Ethiopians, from whom they were parted only by the Red Sea, each dwelling upon the opposite shores of it; or rather, a people in Arabia, frequently mentioned in Scripture, and so called, either for their likeness in colour and complexion to the Ethiopians properly so called, or because the one of these people were a colony of the other. But the Ethiopians above Egypt were far enough from these other Arabians, being separated from them by the Red Sea.
Consult other comments:
2 Chronicles 21:16 - Albert Barnes' Notes on the Bible
2 Chronicles 21:16 - Joseph Benson’s Commentary on the Old and New Testaments
2 Chronicles 21:16 - The Cambridge Bible for Schools and Colleges
2 Chronicles 21:16 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 21:16 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 21:16 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 21:16 - Geneva Bible Notes
2 Chronicles 21:16 - John Gill's Exposition of the Entire Bible
2 Chronicles 21:16 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 21:16 - Old and New Testaments Restoration Commentary
2 Chronicles 21:16 - John Trapp's Complete Commentary (Old and New Testaments)
2 Chronicles 21:16 - The Treasury of Scripture Knowledge
2 Chronicles 21:16 - Whedon's Commentary on the Old and New Testaments
English Annotations on the Holy Bible by Matthew Poole

Matthew Poole (1624–1679) wrote English Annotations on the Holy Bible, completing the chapters as far as Isaiah 58 before his death in 1679. The rest of the Annotations were completed by friends and colleagues among his Nonconformist brethren. The first printing of the completed edition was in 1685, 2 volumes folio, followed by editions in 1688, 1696 (with valuable chapter outlines added by the editors, Samuel Clark and Edward Veale), and the 4th and definitive edition in 1700, the basis of all others.