Rev 5:5-6
"And one of the elders said to me, ‘Do not weep! Behold, the Lion of the tribe of Judah, the Root of David, has conquered, so that he can open the scroll and its seven seals.’ And I saw, and behold, in the midst of the throne and of the four living creatures and among the elders stood a Lamb, as though it had been slain."
The central paradox of Revelation: the Lion is the Lamb. John hears 'Lion' (leon) and sees 'Lamb' (arnion). Christ’s victory was not by lion-like force, but by lamb-like sacrifice. The Lamb 'as though it had been slain' (hos esphagmenon) — the marks of crucifixion are eternal.
Rev 5:9-10
"And they sang a new song, saying, ‘Worthy are you to take the scroll and to open its seals, because you were slain, and by your blood you ransomed people for God from every tribe and language and people and nation; and you have made them a kingdom and priests to our God, and they will reign on the earth.’"
The new song (oden kainen) — new because it is based on redemption, not merely creation. Redemption is universal: every tribe, language, people, and nation. The result: a kingdom of priests — the fulfillment of Ex 19:6 on a cosmic scale.