The document discusses the books that Allah sent to prophets as revelations to guide mankind, including the Suhuf to Ibrahim, the Zaboor to David, the Tawraah to Moses, and the Injeel to Jesus. These books all had the core message that there is no God but Allah. Over time, all the books except the Qur'an were lost or changed by people, but Muslims still believe Allah originally sent them. Now, the Qur'an is the only remaining divine scripture in its original form, protected by Allah.