A.T. Robertson Commentary Revelation 5:12

"saying with a great voice, Worthy is the Lamb that hath been slain to receive the power, and riches, and wisdom, and might and honor, and glory, and blessing." — Revelation 5:12 (ASV)

Worthy (αξιον). Agreeing in gender (grammatical neuter) with αρνιον, but some MSS. have αξιος (masculine, natural gender). Note change to third person εστιν instead of second ε. The point of the song is the same as that in verses 9,10, but the language differs. Note the repeated article το (the lamb the slain) referring to verses 6,9. Note also the one article την before δυναμιν for all the seven grounds of praise (δυναμιν, power, πλουτον, wealth, σοφιαν, wisdom, ισχυν, strength, τιμην, honor, δοξαν, glory, ευλογιαν, blessing), though πλουτον is masculine, in contrast with separate article for each item (all three feminine) in 4:11, here grouping them all together, "a heptad of praise" (Swete).