So the word of the LORD spoken to Jehu was fulfilled: βFour generations of your sons will sit on the throne of Israel.β
KJV
This [was] the word of the LORD which he spake unto Jehu, saying, Thy sons shall sit on the throne of Israel unto the fourth [generation]. And so it came to pass.
ASV
This was the word of Jehovah which he spake unto Jehu, saying, Thy sons to the fourth generation shall sit upon the throne of Israel. And so it came to pass.