How is the call to Allah between tawhid (the oneness of Allah) and other methods?

Question : In my speech regarding the call to Allah, do we speak of tawhid (the oneness of Allah) as the prophets spoke, or do we speak in other ways, such as speaking generally about matters of faith?

Answer : The call to Allah (Mighty and Majestic) is never permissible to deviate from what the messengers called for, but the methods of the call may differ. The scholars today call to Allah (Mighty and Majestic) by telephone, by recording, by radio, by bulletins, and by such means. These means did not exist, as far as we know, in the time of the prophets. However, the core of the call and what a person calls for must not deviate from the path of the prophets. If one calls for what contradicts the path of the prophets, it means he is misguided, as Allah the Exalted said: It is obligatory for the student of knowledge who calls to Allah to understand the difference between the means and the objectives.