Psalm 21:6
For thou hast made him most blessed for ever: thou hast made him exceeding glad with thy countenance.
Cross-reference
Psalm 16:11 explicitly says 'in your presence there is fullness of joy' — a direct parallel to the king's joy in God's presence here.
Psalm 72:17-19 prays for the king's name to endure forever and all nations be blessed, echoing the eternal blessing in the main verse.
Psalm 45:2 says God has blessed the king forever — a direct parallel to 'most blessed forever' here, with messianic overtones.
Psalm 45:7 mentions 'oil of gladness' for the anointed king, similar to the gladness given to the king here.
Psalm 4:6 asks for the light of God's face, similar to the 'joy of your presence' here — both seek divine favor.
Psalm 4:7 contrasts joy from God with earthly abundance, paralleling the king's gladness in God's presence.
Psalm 61:6 prays for the king's years to endure to all generations — echoing the 'forever' blessing here.
1 Kings 2:45 declares Solomon blessed and his throne established forever — directly echoing the king's eternal blessing here.
Genesis 12:2 promises Abraham blessing and a great name, a covenant pattern that the king's blessedness fulfills.
Acts 2:28 quotes Psalm 16:11 about gladness in God's presence, a theme identical to the king's joy here — though not a direct quote.
Numbers 6:25 asks God to make his face shine — the same 'joy of your presence' imagery, now as a blessing for all Israel.