Psalms 89:28 KJV
My mercy will I keep for him for evermore, and my covenant shall stand fast with him.
Psalms 89:28, King James Version
In context
27 Also I will make him my firstborn, higher than the kings of the earth.
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.