‘The People of the Book’ (ahl az-zikr), i.e. those who have a knowledge of historical facts relating to past peoples and past prophets. What had to be ascertained from them was not about truth or untruth: they were to be asked about whether the prophets appearing in past ages were human beings or not. The fact that the Prophet Muhammad was a human being was treated by the people of Makkah as evidence of his not being the prophet of God. They were told to ascertain from the communities among whom prophets had been appearing (just as in the case of the Jews) whether the prophets who appeared among them were human beings or angels. A prophet appears for the purpose of ‘reminding’. This reminding is, in fact, done with the help of arguments. However, it is also necessary for the preacher to prove himself to be absolutely serious in this regard. If a man makes people aware of heaven and hell, but at the same time engages in such activities as prove him to be flippant about heaven and hell, his dawah efforts will become ridiculous in the eyes of the people. However, even if the call of the preacher is of a high standard and is presented in a perfect manner, it will benefit only those who pay attention to it. Those who do not pay attention can never be benefited by the call of truth