Typically, when someone is thinking of the “lion and the lamb,” Isaiah 11:6 is in mind due to it often being misquoted, “And the wolf will dwell with the lamb, and the leopard will lie down with the young goat, and the calf and the young lion and the fatling together …” The true “Lion and the Lamb” passage is Revelation 5:5–6. The Lion and the Lamb both refer to Jesus Christ. He is both the conquering Lion of the tribe of Judah and the Lamb who was slain. The Lion and the Lamb are descriptions of two aspects of the nature of Christ. As the Lion of Judah, He fulfills the prophecy of Genesis 49:9 and is the Messiah who would come from the tribe of Judah. As the Lamb of God, He is the perfect and ultimate sacrifice for sin.
The scene of this passage is the heavenly throne room (Revelation 4–5). After receiving the command to write to the seven churches in Asia Minor, John is “caught up in the spirit” to the throne room in heaven where he is to receive a series of visions that culminate in the ultimate victory of Christ at the end of the age. Revelation 4 shows us the endless praise that God receives from the angels and the 24 elders. Chapter 5 begins with John noticing that there is a scroll in the “right hand of him who was seated on the throne.” The scroll has writing on the inside and is sealed with seven seals.
After giving us a description of the scroll, an angel proclaims with a loud voice “Who is worthy to open the scroll and break its seals?” John begins to despair when no one comes forth to answer the angel’s challenge. One of the 24 elders encourages John to “weep no more,” and points out that the Lion of the tribe of Judah has come to take and open the scroll. The Lion of the tribe of Judah is obviously a reference to Christ. The image of the lion is meant to convey kingship. Jesus is worthy to receive and open the scroll because he is the King of God’s people.
Back in Genesis 49:9, when Jacob was blessing his sons, Judah is referred to as a “lion’s cub,” and in v. 10 we learn that the “scepter shall not depart from Judah.” The scepter is a symbol of lordship and power. This was a prophecy that in Israel the kingly line would be descended from Judah. That prophecy was fulfilled when David succeeded to the throne after the death of King Saul (2 Samuel). David was descended from the line of Judah and his descendents were the kings in Israel/Judah until the time of the Babylonian captivity in 586 BC.
This imagery of kingship is further enhanced when Jesus is described as the “root of David.” This harkens us back to the words of Isaiah the prophet: “There shall come forth a shoot from the stump of Jesse, and a branch from his roots shall bear fruit … In that day the root of Jesse, who shall stand as a signal for the peoples—of him shall the nations inquire, and his resting place shall be glorious” (Isaiah 11:1, 10). By calling Jesus the root of David, He is not only being identified as a descendant of David, but also the source or “root” of David’s kingly power.
Why is Jesus worthy to open the scroll? He is worthy because He “has conquered.” We know that when Jesus returns, He will conquer all of God’s enemies, as graphically described in Revelation 19. However, more importantly, Jesus is worthy because He has conquered sin and death at the cross. The cross was the ultimate victory of God over the forces of sin and evil. The events that occur at the return of Christ are the “mop up” job to finish what was started at the cross. Because Jesus secured the ultimate victory at Calvary, He is worthy to receive and open the scroll which contains the righteous judgment of God.
Christ’s victory at the cross is symbolized by his appearance as a “Lamb standing, as though it had been slain.” Prior to the exodus from Egypt, the Israelites were commanded by God to take an unblemished lamb, slay it, and smear its blood on the doorposts of their homes (Exodus 12:1–7). The blood of the slain lamb would set apart the people of Israel from the people of Egypt when the death angel came during the night to slay the firstborn of the land. Those who had the blood of the lamb would be spared. Fast forward to the days of John the Baptist. When he sees Jesus approaching him, he declares to all present, “Behold, the Lamb of God, who takes away the sin of the world!” (John 1:29). Jesus is the ultimate “Passover lamb” who saves His people from eternal death.
So when Jesus is referred to as the Lion and the Lamb, we are to see Him as not only the conquering King who will slay the enemies of God at His return, but also as the sacrificial Lamb who took away the reproach of sin from His people so they may share in His ultimate victory.
 Got Questions Ministries. (2010). Got Questions? Bible Questions Answered. Bellingham, WA: Logos Bible Software.