Psalms 89:29 KJV

His seed also will I make to endure for ever, and his throne as the days of heaven.
Psalms 89:29, King James Version

In context

28 My mercy will I keep for him for evermore, and my covenant shall stand fast with him.

29 His seed also will I make to endure for ever, and his throne as the days of heaven.

30 If his children forsake my law, and walk not in my judgments;