Firstly, al-Daʿwah al-Salafīyyah is the pure Religion which calls to Tawḥīd and sincerity of worship. It is the daʿwah or the call to belief in Allāh, His Angels, His Books, His Messengers, the Day of Judgement, and belief in Qadar (pre-Decree). Therefore, al-Daʿwah al-Salafīyyah is the daʿwah of all of the Prophets, from Nūh who was the first Prophet, all the way to Muḥammad ﷺ who was the last and final Prophet and Messenger to be sent to mankind.
Al-daʿwah al-Salafīyyah is the daʿwah of the people to act in accordance with that which the Messenger of Allāh ﷺ was upon and that which his companions were upon after him, from worshipping Allāh with sincerity and acting in accordance with the Qurʿān and the Sunnah in worship, as well as in our day to behaviour in our association with others. This is Salafīyyah.