When the call of Muhammad bin Abdul-Wahhab began to spread to combat the heresies and superstitions that were widespread at that time in
Najd in particular and the Arabian Peninsula in general, the call was subjected to harassment in attempts by some to get rid of Muhammad bin Abdul-Wahhab, and when he felt this, he decided to move from his hometown of
Uyayna to
Diriyah. Most of the rulers of the region were afraid to embrace this call, for fear of those who might confront him, especially since there were many who did not see any violation in the innovations and superstitions that Muhammad bin Abdul Wahhab was fighting. Muhammad bin Saud feared two things if he supported Ibn Abdul-Wahhab's call. First: that the sheikh would abandon him to another place and replace him with someone else. Second: that the sheikh would stand up to the money he took from the people of Diriyah. Therefore, Ibn Saud wanted there to be a covenant and covenant between him and the caller. He said to him: “O Sheikh, this is the religion of God and His Messenger about which there is no doubt, and I give good tidings of support for you and for what you have been commanded to do and jihad for those who violate monotheism, but I want to impose two conditions on you: The first: If we support you and jihad for the sake of God, God will open the countries for us and for you.” I am afraid that you will leave us and replace us with others. Second: I have a law regarding Diriyah (that is, what the weak give to the strong to protect and defend it) that I take from them at the time of fruition, and I am afraid that you will say, “Do not take anything from them.” The sheikh replied: “O prince, as for the first, spread your hand, blood for blood, and demolition for demolition, and as for the second, perhaps God will open conquests for you, and God will compensate you from the spoils with what is better than them.” Then Muhammad bin Saud extended his hand and pledged allegiance to Muhammad bin Abdul Wahhab on supporting the religion of God and His Messenger, jihad for the sake of God, establishing the laws of
Islam, and enjoining good and forbidding evil. Historian Hussein bin Ghannam says: “The sheikh remained in control of making and contracting, taking and giving, presenting and delaying, and he did not ride an army and no opinion was issued by Muhammad bin Saud or his son Abdulaziz, except from his words and opinions. When God conquered Riyadh and the area of Islam expanded, the paths were secure, and every difficult person was saved from present and past, the Sheikh placed the matter in the hands of
Abdulaziz bin Muhammad bin Saud and delegated the affairs of the Muslims and the treasury to him. Diriyah became a center for spreading the reformist call of Muhammad bin Abdul-Wahhab, and students of religion flocked to it, who later became supporters of the call and the state, and the sheikh began sending his messages to the princes of neighboring countries and tribal leaders, informing them of what he called for in terms of reviving religion and combating heresies. == Formal pact ==