We believe in the Torah, the Gospel, and the Psalms, as Allah says in His Quran. We also believe that Allah has sent down other books and pages except them. But only Allah knows their names and numbers. This is clear in the following verses:
''And It (Quran) is in the scriptures of the ancients.'' (Surah ash-Shuara, 196)
''This is in the former scriptures. The Scriptures of Abraham and Moses.'' (Surah al-A'la, 18-19)