بِسْمِ اللهِ الرَّحْمٰنِ الرَّحِيْمِ
b-ismi-llāhi r-raḥmāni r-raḥīmi
The Torah, The Psalms, The Gospel, The Qur'an
All contain the word of God. All are the books of God. The books of God before the Qur'an are considered legitimate and confirmed in the Qur'an in QS Al Aḥqāf [46]:12, QS Al Baqarah [2]: 89, 97, 101 that the books that are in the hands of the Scribes (Nazrani), Israelites or not, are divine signs, and mercy, and instruction for life from the Lord God. إِمَامًا وَرَحْمَةً ۚ وَهَٰذَا
If hypocrites' actions are not the same as the teachings in the scriptures that we read, it doesn't the book has changed, but only the people.