(Annajm) 53 : 56
هَٰذَا نَذِيرٌ مِنَ النُّذُرِ الْأُولَىٰ
This is a warning from the warnings of earlier.
The only Book Adhikr is revealed as warning from Messenger Noah to Messenger Muhammed. And Muhammed has not brought any new warning as the Maccan pagans were arguing. Just like that Messenger is also not a new warner, instead he is the last Messenger and prophet as explained in verse 33: 40. See explanation 5: 48; 21: 24-25; and 42: 13-14.