American Standard Version (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.
King James Version (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.