Shared ground
Revelation 5:8–10 presents the Lamb receiving the scroll and immediately being honored in the same heavenly throne-room setting as God was in chapter 4. The four living creatures and the twenty-four elders fall down before the Lamb, showing that the Lamb is a proper recipient of worship in this vision.
The scene uses temple-like images: harps for sung praise and golden bowls of incense. The text itself identifies the incense as “the prayers of the saints,” so the vision ties the worship of heaven to the prayer-life of God’s people.
The “new song” explains why the Lamb is worthy: he was killed, and his blood “purchased” people “for God” from every tribe, language, people, and nation. The result is a changed status for those purchased: they become “a kingdom and priests” (or “kings and priests”) for God, with an additional claim about reigning “on earth.”
Where interpretation differs
“Bought us” or “bought them” (v. 9). Some argue the singers include themselves among the redeemed (“bought us”), while others think the song describes a group distinct from the singers (“bought them”). Either way, the song’s main point is that the Lamb’s death secures a people for God drawn from all kinds of human communities.
“Kings” or “a kingdom” (v. 10). Some read the phrase as emphasizing individual rule (“kings and priests”); others read it as a corporate identity (“a kingdom and priests”). Both readings still communicate elevated status and priestly access/service for God’s people.
“They reign on earth” (v. 10). Some take this as a future, concrete reign on the earth; others take it as a present or symbolic statement of rule that is real but not yet obvious, expressed in visionary language. The text at least points beyond the throne-room scene to an earthly outcome.
Who are the “saints” (v. 8). Some take “saints” broadly as all God’s people; others narrow it to faithful believers under pressure (and, in the wider book, especially those suffering). In either case, their prayers are portrayed as present before the Lamb.
Why the disagreement exists
These differences arise because the passage is poetic and sung (so its lines can be compact), because ancient manuscripts vary at key pronouns, and because the vision blends heavenly imagery with claims about earth, raising questions about timeline and literalness.
What this passage clearly contributes
The passage explicitly connects the Lamb’s worthiness to his death and blood, and explicitly links that death to purchasing people for God from every nation-like grouping. It also explicitly portrays the prayers of the saints as part of the heavenly court’s worship. Theological inferences often drawn from this include that the Lamb shares in God’s honor in heaven and that the Lamb’s death creates a multi-ethnic people with a priestly role toward God and a destiny that includes reigning “on earth,” though details of how and when that reign is expressed are debated.