The answer is: Thousands upon thousands of angels

Rev 5 vs 11-12

In the Book of Revelation, the phrase "Worthy is the Lamb who was slain" rings out in a grand cosmic chorus, showcasing a pivotal moment in the heavenly court. This proclamation is no ordinary cheer; it reverberates through the very fabric of divine history and calls attention to this iconic symbol of sacrifice in the Christian narrative.

Interestingly, the scene unfolds in Revelation 5, where John of Patmos witnesses a scroll sealed with seven seals—a representation of God's plan for humanity’s redemption. Imagine a drama in the cosmos, where thousands upon thousands of angels lift their voices in harmonious celebration of the Lamb, a reference to Jesus' sacrificial role. What’s cool is the parallels this creates with other texts; the imagery echoes the Passover lamb in Exodus, which also symbolizes deliverance. It's fascinating how biblical authors weave these symbols into the larger tapestry, confirming themes of salvation and mercy.

Going a bit deeper, Revelation is filled with creative numerology and symbolism—it’s not just a crystal-clear narrative. Seven seals, seven churches, concepts of infinity—everything signifies completeness in God's plan. And let’s spare a thought for that using "thousands upon thousands." This could also hint at the incomprehensible multitude of creation praising the divine—think of it like a celestial assembly! It really ramps up the event's magnitude and underscores how universal divine acknowledgment goes beyond just humankind. There's a joyful resonance in this celestial acknowledgment of worthiness that transcends time, connecting us with the very essence of grace and purpose.