2 Kings 10:30 - Joseph Benson’s Commentary on the Old and New Testaments

The Lord said unto Jehu By some prophet. Because thou hast done well, &c. That is, in part. The extirpating of idolaters and idolatry was a thing so far right in God's eyes, idolatry being an iniquity which he visits as surely and severely as any other, and which is a source of a variety of other abominations. Thy children of the fourth generation shall sit on the throne Which they did, namely, Jehoahaz, Joash, Jeroboam, and Zachariah. This was more than took place in any of the other royal families of that kingdom. Of the house of Ahab, indeed, there were four kings, but the last two, namely, Ahaziah and Joram, were brothers, so that its reign reached only to the third generation, and that whole family continued but about forty-five years in all: whereas Jehu's house continued in power for four generations after himself, and in all about a hundred and twenty years: for no services done for God shall go unrewarded.