The four revealed books mentioned in the Qur'an are the Injil (Gospel), Tawrah (Torah), Zabur (Psalms), and Qur'an itself. The Injil is the holy book of Christians, which contains the teachings of Prophet Isa (AS) (Jesus), the Tawrah is the holy book of Jews, which contains the teachings of Prophet Musa (AS) (Moses), and the Zabur is the holy book of the Prophet Dawud (AS) (David). The Qur'an is considered the final and complete revelation from Allah to humanity and is the primary source of guidance and instruction for Muslims. The four books share many similarities, including a belief in one God, ethical principles, and a call to righteous behavior. The Qur'an emphasizes the importance of following the guidance of all of the prophets and messengers and incorporates many of their teachings into its message of faith and salvation.