وَقَدْ آتَيْنَاكَ مِن لَّدُنَّا ذِكْرًا (And We have given to you, from Ourself, a (book on advice. - 20:99) According to a majority of commentators the word (advice) in the present context means the Qur'an.
He has revealed to you ˹O Prophet˺ the Book in truth, confirming what came before it, as He revealed the Torah and the Gospel