In response to a command we do not repeat the command. What folly it would be for a hungry man to be invited into your house and told to eat and he sits at the table and says “eat”!
Nobody in the Bible ever said hallelujah to Yahweh.
Hallelujah is a command. It orders one to halal yah[weh]
The proper response would be to ascribe something to God.
• You are great
• I love you
• I halal you
Holy is the unceasing sound of angels
Who tells God to praise God?