Al-Baqarah (2:136) says Muslims should believe in the revelations given to Moses.... and Jesus.

Revelations given to Moses include the first five books of the Old Testament:

1. Genesis
2. Exodus
3. Leviticus
4. Numbers
5. Deuteronomy

Muslims should believe them.

And then how should they believe in the revelations from Jesus.... unless they read his word from the other books? That would be the gospels:

1. Matthew
2. Mark
3. Luke
4. John

And also the book of REVELATION, the book given by Jesus to John. The Quran instructs Muslims to believe these revelations. But how will Muslims believe them unless they read them? Or unless someone tells them the revelations?

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How I searched the Quran and found this admonishment to believe the prophets: search-the-quran.com