2 Chronicles 35:21

“But he sent ambassadors to him, etc.] That is, Necho sent to Josiah: saying, what have I to do with thee, thou king of Judah? signifying he had no quarrel with him, he did not come to fight with him, and he had no business to intermeddle between him and another prince: I come not against thee this day; in an hostile manner: but against the house wherewith I have war; the king of Assyria: for God commanded me to make haste; and oppose his enemy: according to the Targum, it was his idol; and which is the sense of other Jewish writers f160; but the true God might have appeared to him in a dream, or sent a prophet to him; or at least he might pretend this, that it might have the greater effect…”

“But he sent ambassadors . . . What have I to do with thee, thou king of Judah?--Not wishing to spend time, or strength in vain, Necho informed the king of Judah that he had no intention of molesting the Jews; that his expedition was directed solely against his old Assyrian enemy; and that he had undertaken it by an express commission from God. Commentators are not agreed whether it was really a divine commission given him through Jeremiah, or whether he merely used the name of God as an authority that Josiah would not refuse to obey. As he could not know the truth of Necho's declaration, Josiah did not sin in opposing him; or, if he sinned at all, it was a sin of ignorance. The engagement…”

“The house wherewith I have war - Necho viewed Babylon as the successor and representative of Assyria - the hereditary enemy of Egypt - and he means that he is merely continuing an old hostility with which Josiah has nothing to do. No doubt the Assyrian and Egyptian armies had often passed up and down Syria by the coast route, without approaching Jerusalem, or even touching the soil of Judaea. God commanded me to make haste: forbear thee from meddling with God - These are remarkable words in the mouth of a pagan; but ancient inscriptions show that the Egyptian kings, in a certain sense, acknowledged a single supreme god, and considered their actions to be inspired by him. (e. g. The god Tum…”

“The house - Against the house of the king of Assyria, between whom and me there is war. It is at thy peril, if thou engage against one who has both a better army, and a better cause and God on his side. 2 Chronicles 35:22”

“What: Sa2 16:10; Mat 8:29; Joh 2:4 house wherewith I have war: Heb. house of my war God: Kg2 18:25; Isa 36:10 forbear thee: Ch2 25:19 2 Chronicles 35:22”