Jewish rabbis, Christian monks, and Arab soothsayers had spoken about the prophet of Allah (SAS) before his mission when his time drew near. As to the rabbis and monks,knew about his description and the description of his time which they found in their scriptures and what their prophets had enjoined upon them.
As to the Arab soothsayers they had been visited by satans from the jinn with reports which they had secretly overheard before they were prevented from hearing by being pelted with stars. Male and female soothsayers continued to mention of some of these matters to which the Arabs paid no attention until Allah sent him and these things which had been mentioned happened and they recognized them.
When the prophet’s mission came the satans were prevented from listening and they could not occupy the seats in which they used to sit and steal the heavenly tidings for they were pelted with stars, and the jinn knew that that was due to an order which Allah had commanded concerning mankind.