Worthy is the Lamb

Then I looked and heard the voice of many angels, numbering thousands upon thousands, and ten thousand times ten thousand. They encircled the throne and the living creatures and the elders. In a loud voice they were saying: “Worthy is the Lamb, who was slain, to receive power and wealth and wisdom and strength and honor and glory and praise!”
— Revelation 5.11-12 (NIV)

The four living creatures; man, lion, ox, and eagle have been used as symbols for the four evangelists: Matthew, Mark, Luke, and John respectively in the ancient church. Also depicted is the Lamb of God carrying the banner of victory–Agnus Dei.