Revelation 5:5 But one of the elders said to me, “Do not weep. Behold, the Lion of the tribe of Judah, the Root of David, has prevailed to open the scroll and to loose its seven seals.”

John was sad because no one was worthy to open the scroll.
Then a revelation of One who is worthy.
Look at the description.
It is not a Christian description but Jewish using the terms Judah and David.
Did you know that Judah is only used in the New Testament in the genealogy of Christ, twice in the Book of Hebrews, and twice in Revelation?
David is used more often, especially by the writers of the Gospels or when talking to a Jewish audience in the Book of Acts.
Paul used David three times to the Romans and once to Timothy.
The writer of Hebrews used it twice.
In my opinion, the point is this: the Christian church knows and recognizes the Christ and Messiah is of the lineage of the Hebrew tribe of Judah and the royal bloodline of King David.
But it does not have the same historic meaning to the church as it does to Judaism.
The phrase is spoken to John, a Jew, and is a proud Jewish statement.
It brings back the ancient promises of God through the Law and the Prophets and ties it together with Messiah.
In fact, Revelation brings back ancient imagery not used in the other books of the New Testament.
Prophets like Isaiah, Ezekiel, and Daniel used such imagery as described in Revelation 4:7.
Again, it is my opinion the Book of Revelation is not a revelation of end times so much as it is a revelation of the Messiah to Israel.
After all, remember that Yeshua (Jesus) is Jewish, of the tribe of Judah and the Root of David and He came and was rejected by His own, who, to this day, still reject that Messiah has come.