(Asshuara’) 26 : 196
وَإِنَّهُ لَفِي زُبُرِ الْأَوَّلِينَ
And indeed, it is present in the previous scriptures.
Adhikr sent down to Messenger Muhammad contains all 312 previous Books and their upright Explanations as explained in verse 2: 2. See explanation 5: 48; 15: 90-91 and 21: 24-25.