John uses a combination of Daniel 7 and Psalm 110:1

The Son of Man “I kept looking in the night visions, And behold, with the clouds of heaven One like a Son of Man was coming, And He came up to the Ancient of Days And came near before Him. And to Him was given dominion, Glory, and a kingdom, That all the peoples, nations, and men of every tongue Might serve Him. His  dominion is an everlasting  dominion Which will not be taken away; And His kingdom is one Which will not be destroyed. Daniel 7:13-14

Yahweh says to my Lord: “Sit at My right hand Until I put Your enemies as a footstool for Your feet.” Psalm 110:1 (most quoted OT verse in NT)