John Wesley on 2 Chronicles 30:1

Israel - All the persons of the ten tribes, who were settled in his kingdom. Ephraim, &c. - To all the remainder of the ten tribes, ver.5, here expressed by the names of Ephraim and Manasseh, as elsewhere by the name of Ephraim only. But he names these two tribes, because they were nearest to his kingdom, and a great number of them had long since, and from time to time joined themselves to the kingdom of Judah, 2Chron 15:8,9. At Jerusalem - Admonishing them of their duty to Cod, and persuading them to comply with it.