Revelation 5:5

One of the 24 elders comforted John with the news that Jesus Christ would open the scroll (cf. Luke 7:13; Luke 8:52). He had achieved victory over all God’s enemies and therefore had the authority to open the scroll and to release its contents. The "Lion . . . of Judah" (Genesis 49:9) and the "Root [offspring] of David" (Isaiah 11:1; Isaiah 11:10; Jeremiah 23:5; Jeremiah 33:15; Matthew 22:42-43; Romans 15:12) are both titles of the divine Messiah who would fulfill the Old Testament promises of salvation and rule. This is the only place in the New Testament where they occur together, however. As God’s ultimate Anointed One, Jesus alone possessed the authority necessary for this task. He overcame Satan, sin, and death, so He could implement God’s purposes for the future that this scroll revealed. [Note: See David J. MacLeod, "The Lion Who Is a Lamb: An Exposition of Revelation 5:1-7," Bibliotheca Sacra 164:655 (July-September 2007):323-40.]