Psalm 89:27 in the World English Bible
I will also appoint him my firstborn, the highest of the kings of the earth.
Context
26 He shall cry unto me, Thou art my father, my God, and the rock of my salvation.
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.