Who is Abd al-Wahhaab?

I'm asking this question to see if people actually know who he is and what he preached.
Update: WAlaikum Salam Warahmatullah Wabarakatahu
Update 2: Everyone who has any knowledge of the movement of Shaykh Muhammad ibn ‘Abd al-Wahhaab (may Allaah have mercy on him) and his message knows that he sought to spread the message of pure Tawheed and to warn against shirk in all its forms, such as attachment to the dead, or to trees and rocks, etc. In his ‘aqeedah... show more Everyone who has any knowledge of the movement of Shaykh Muhammad ibn ‘Abd al-Wahhaab (may Allaah have mercy on him) and his message knows that he sought to spread the message of pure Tawheed and to warn against shirk in all its forms, such as attachment to the dead, or to trees and rocks, etc. In his ‘aqeedah (belief), he was following the way of the righteous Salaf and the Taabi’een [i.e., the earliest generations of Islam], as is indicated by his books and fatwas, and the books of his followers among his sons and grandsons and others. All of these books are in print and are in circulation among the people. His message was in accordance with the Book of Allaah and the Sunnah of His Messenger (peace and blessings of Allaah be upon him).
Update 3: Wahhaabism is not a new way or a new school of thought; rather it is a call to Tawheed and the revival of aspects of the religion that had been forgotten. Sheikh Muhammed said: What you have to do is to beware of those who warn you against the Wahhaabis, because they are warning you against following the... show more Wahhaabism is not a new way or a new school of thought; rather it is a call to Tawheed and the revival of aspects of the religion that had been forgotten.

Sheikh Muhammed said:

What you have to do is to beware of those who warn you against the Wahhaabis, because they are warning you against following the truth and the early generation of this ummah. Applying the word “Wahhaabis” to those who adhere to correct belief and warning people against them is the way of the ignorant and biased.
Update 4: Shia's, I recommend you to read Kitaab al-Tawheed alladhi huwa haqq Allaah ‘ala al-‘Abeed [Kitaab al-Tawheed is available in English translation] – you will find out how great the Shaykh’s knowledge was, and how important his call is, and the extent to which his words have been twisted and accusations have been... show more Shia's, I recommend you to read Kitaab al-Tawheed alladhi huwa haqq Allaah ‘ala al-‘Abeed [Kitaab al-Tawheed is available in English translation] – you will find out how great the Shaykh’s knowledge was, and how important his call is, and the extent to which his words have been twisted and accusations have been made against him.
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