Surah al Baqarah Verse 4 (Quran 2:4):
And who believe in what has been revealed to you, [O Muhammad], and what was revealed before you, and of the Hereafter they are certain [in faith].
The following excerpt is taken from “Dawat ul Quran” surah 2 note #9:
“That is: those people are above all the gtoup, national, regional, geographical and racial prejudices. They do not discriminate among the Books revealed by God, so that one book is acceptable and the other is not. They accept all the Divine Books as true, whether they might have been revealed to their own prophet or to the prophets of other communities. But those who do not believe in the guidance from Allah, or those who accept the Book which was revealed to the prophet of their own community or race only will not be able to seek guidance from the Quran.
Jews had accepted Torah, the Book which was revealed to prophet Moosa (Moses) as the Divine Book, but they refused to accept as divine books the Bible, which was revealed to Prophet Issa (Jesus) and the Quran which was revealed to Prophet Muhammad (peace be upon him). Similarly, Christians had recognized Torah and the Bible as the Revealed Books, but did not recognize Quran as one. The Quran teaches its followers to rise above all prejudices and believe in the Torah, Injeel (Bible) and the Quran and in all other Books revealed to other prophets as Divine Books.”