 At the end of his treatise, "Al-Hadiyyah al-Suniyyah", Ibn ʿAbd al-Wahhab's son 'Abd Allah speaks positively on the practice of tazkiah (purification of the inner self).According to author Dore Gold, in "Kitab al-Tawhid", Ibn Abd al-Wahhab described followers of both the Christian and Jewish faiths as sorcerers who believed in devil worship, and cited a hadith of Muhammad stating that punishment for the sorcerer is `that he be struck with the sword.` Wahhab asserted that both religions had improperly made the graves of their prophet into places of worship and warned Muslims not to imitate this practice.Wahhab concluded that `The ways of the people of the book are condemned as those of polytheists.`

However, author Natana J. DeLong-Bas defends Abdul Wahhab, stating that

despite his at times vehement denunciations of other religious groups for their supposedly heretical beliefs, Ibn Abd al Wahhab never called for their destruction or death … he assumed that these people would be punished in the Afterlife …"
Historical accounts of Wahhab also state that "Muhammad ibn ʿAbd al-Wahhab saw it as his mission to restore a more purer and original form of the faith of Islam.