7 Behold, he is coming with the clouds, and every eye will see him, including those who pierced him. All the tribes of the earth will mourn over him. Even so, Amen.
Behold He is coming in the clouds – this is the description of the LORD’s Day that Christ gave us in Matt 24:30, from Dan 7:13. The Book of Daniel is the foundation of the Book of Revelation. Daniel saw the Spirit of Christ as “the Son of Man,” coming toward the “Ancient of Days.”
Every eye will see Him, even those who pierced Him – In Matt 24:30, Jesus also quoted this famous verse of Zech 12:10.