2 Chronicles 35:21 Commentary - English Annotations on the Holy Bible by Matthew Poole
Against the house wherewith I have war, Heb. against the house or family of my war, i.e. against the house of the king of Assyria, between whom and me there is war.
God commanded me; either his false god by their lying priests; or the true God, either,
1. By some prophet; for God’s prophets used sometimes to deliver or send commands from God to heathen kings. Though it is not probable either that Pharaoh would regard the command of the true God; or that a prophet of the Lord would not acquaint Josiah with this message; or that Josiah would oppose Pharaoh in a war undertaken by God’s command. Or rather,
2. By a dream, as God spoke to another heathen king, Abimelech, Gen 20:3. Though it is not impossible that he pretended this for his own advantage, that Josiah might not assist his enemies.
Consult other comments:
2 Chronicles 35:21 - Albert Barnes' Notes on the Bible
2 Chronicles 35:21 - Joseph Benson’s Commentary on the Old and New Testaments
2 Chronicles 35:21 - The Cambridge Bible for Schools and Colleges
2 Chronicles 35:21 - Adam Clarke's Commentary and Critical Notes on the Bible
2 Chronicles 35:21 - Companion Bible Notes, Appendices and Graphics
2 Chronicles 35:21 - Ellicott's Commentary for English Readers (Old and New Testaments)
2 Chronicles 35:21 - John Gill's Exposition of the Entire Bible
2 Chronicles 35:21 - Biblical Illustrator Edited by Joseph S. Exell
2 Chronicles 35:21 - English Annotations on the Holy Bible by Matthew Poole
2 Chronicles 35:21 - The Treasury of Scripture Knowledge
2 Chronicles 35:21 - 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.