The Salafi Da'wah is that of the Qur'an and the Sunnah. It is the Religion of Islam - pure and free from any additions, deletions or alterations. It is to adhere to the Path of the Messenger (sallallahu 'alaihi wa sallam) and of the True Believers (as-Salaf us-Salih). As-Salaf is a collective term referring to the Pious Pioneers in Islam and all those who follow in their footsteps in belief, actions and morals.
Allah has said (what means): Whoever contends with and contradicts the Messenger after guidance has been clearly conveyed to him, and follows a path other than that of the Faithful Believers, We shall leave him in the Path he has chosen and land him in Hell, what an evil destination! [An Nisa 4:115].
Shaikh ul-lslam ibn Taymiyyah (rahimahullah) commented on this ayah: "All who contradict and oppose the Messenger , after the right path has been clearly shown to them, have followed other than the Path of the Believers. And all who follow other than the Path of the Believers have contradicted and opposed the Messenger . If one thinks that he is mistaken in following the Path of the FaithfulBelievers, he is in the same position as one who thinks that he is mistaken in following the Messenger .