In the Holy Koran, there is a particular verse that command the believers to believe in the Book before the Quran. " O you who believe, believe in Allah and His Messenger, and the Book which He sent down upon His Messenger, and the Book which He sent down earlier . And whoever disbelieves in Allah, and His Angels, and His Books, and His Messengers, and the Last Day, then he has certainly gone far astray ." (the Quran 4:136) “The Book which He sent down earlier ” or “the Scripture which He sent down before” is in singular form, which means that there is “only” one Book that every believer has to believe in other than the Quran. But which one? There are many books that had been sent down before Muhammad. The Torah, Psalms, and the Gospel, to name a few; not to mention the books that were given to the Prophets like Isaiah, Jeremiah, Ezekiel, Jonah, etc. To identify which book that the Quran talked about in the verse above, we have to look in some other verses: 1. “And befor...