Daniel 12:4 NASB
[4]But as for you, Daniel, conceal these words and seal up the book until the end of time; many will go back and forth, and knowledge will increase."
But in verse 9 it says
Daniel 12:9 NASB
[9]He said, "Go your way, Daniel, for these words are concealed and sealed up until the end time.
In verse 4 it seems like Daniel sealed the book but in verse 9 the narrative changes, So was it Daniel or somebody else who sealed the book?