The Role of the Imams of the Da'wah in Najd in Reviving 'Aqeedah and Tawhid

Question:
A questioner from this country also asks: Did the callers to Islam in Najd have a role in reviving the creed and the oneness of Allah in this land?

Answer:
They called to Allah and excelled in this, and their leader in that was Shaykh Muhammad ibn 'Abd al-Wahhab (may Allah have mercy on him). Indeed, Allah the Exalted had mercy on the Ummah in his time, in the second half of the twelfth century, and he called to the oneness of Allah. He authored books and letters to the scholars and the princes, until Allah guided through his hands those whom He guided. It became a great revival of Islam in this peninsula, and Allah benefited the people through him until it spread to the peninsula, India, the Levant, Iraq, Egypt, and others. All of this is by the grace of Allah the Exalted. His followers, from his sons and others, were upon this path.
They authored letters and books, and called to Allah from the minbars and other places. They guided the people to the oneness of Allah and obedience to Allah, and warned against religious innovations, division, and disagreement. They clarified to them the reality of shirk (associating partners with Allah) and the reality of tawhid (the oneness of Allah), until the religion of Allah became manifest and the types of shirk were removed from the peninsula by their hands (may Allah have mercy on them), especially in Najd and the surrounding areas, then in the Hijaz, and then it spread, praise be to Allah.