Charles Ellicott Commentary 2 Kings 10:30

"And Jehovah said unto Jehu, Because thou hast done well in executing that which is right in mine eyes, [and] hast done unto the house of Ahab according to all that was in my heart, thy sons of the fourth generation shall sit on the throne of Israel." — 2 Kings 10:30 (ASV)

And the Lord said. —Perhaps through Elisha.

And have done. —So the Syriac and Arabic versions. The Hebrew lacks the and.

Your children of the fourth generation. —The fulfillment of this oracle is noted in 2 Kings 15:12. (Compare the words of the commandment, visiting the sins of the fathers upon the children unto the third and fourth generation; Exodus 20:5.)