thy throne shall be established forever
Root and Offspring of David
2 Samuel 7:16 (KJV) And thine house and thy kingdom shall be established for ever before thee: thy throne shall be established for ever.
Luke 3:31 Which was the son of Melea, which was the son of Menan, which was the son of Mattatha, which was the son of Nathan, which was the son of David,
Revelation 22:16 I Jesus have sent mine angel to testify unto you these things in the churches. I am the root and the offspring of David, and the bright and morning star.