And Jonadab saith unto the king, 'Lo, the sons of the king have come; as the word of thy servant, so it hath been.'

And Jonadab said to the king: "Behold, the sons of the king are here. In accord with the word of your servant, so it has happened."

The watchman, as his duty was, had sent immediate notice to the king that he saw a crowd approaching (see 2-Kings 9:17-20). Jonadab, who was with the king, was prompt to give the explanation.

And Jonadab said unto the king, Behold, the king's sons come: as thy servant said, (o) so it is.
(o) That only Amnon is dead.

And Jonadab said to the king, behold, the king's sons come,.... For as they came nearer, it was plainly discovered that they were the king's sons, seen on the side of the hill:
as thy servant said, so it is; he seems to applaud himself, and exult at his penetration and foresight.