Charles Ellicott Commentary 2 Chronicles 25:7

"But there came a man of God to him, saying, O king, let not the army of Israel go with thee; for Jehovah is not with Israel, [to wit], with all the children of Ephraim." — 2 Chronicles 25:7 (ASV)

The Lord is not with Israel. —Compare 2 Chronicles 19:2; 2 Chronicles 20:37; also 2 Chronicles 16:7.

Namely, with all the children of Ephraim. —Added as an explanation of the term Israel. Ephraim was the name of the northern kingdom (Hosea 5:11; Hosea 5:14; Hosea 6:4, and throughout).