This being the Feast of Christ the King let us look at the source of the acclamation For yours is the kingdom, power and glory:
Book of Daniel 7:13-14
As the visions during the night continued, I saw coming with the clouds of heaven
One like a son of man.
When he reached the Ancient of Days and was presented before him,
He received dominion, splendor, and kingship;
all nations, peoples and tongues will serve him.
His dominion is an everlasting dominion that shall not pass away,
his kingship, one that shall not be destroyed.
Earlier in Daniel 2:37-38 there is something similar:
This was the dream; the interpretation we shall also give in the king’s presence.
You, O king, are the king of kings; to you the God of heaven has given dominion and strength, power and glory.