Translation of the verse 22 from Surah At-Takwir : Number of verses 29 - - page 586 - Part 30.
And (O people) your companion (Muhammad (Peace be upon him)) is not a madman;
And your companion is not [at all] mad.
(81:22) (O people of Makkah), your companion *18 is not mad;
*18) "Your Companion": the Holy Messenger of Allah (upon whom be peace). Here, making mention of the Holy Prophet as the companion of the people of Makkah, they have been made to realize that the Holy Prophet was no.stranger for them. He was not an outsider but a man of their own clan and tribe; he had lived his whole life among them; even their children knew that he was a very wise man. They should not be so shameless as to call such a man a mad man. (For further explanation, see E.N.'s 2, 3 of An-Najm).
Source : At-Takwir Verse 22: And your companion is not [at all] mad.