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"Say (O Muhammad sal-Allaahu 'alayhe wa sallam): "O mankind! Verily, I am sent to you all as the Messenger of Allaah - to Whom belongs the dominion of the heavens and the earth, Laa ilaaha illaa Huwa (none has the right to be worshipped but He); It is He Who gives life and causes death, So believe in Allaah and His Messenger (Muhammad sal-Allaahu 'alayhe wa sallam), the Prophet who can neither read nor write (i.e, Muhammad sal-Allaahu 'alayhe wa sallam) who believes in Allaah and His Words [(this Qur'aan), the Tauraat (Torah) and the Injeel (Gospel) and also Allaah's Word: "Be!" - and he was, i.e, 'Eesaa (Jesus) son of Maryam (Mary)], and follow him so that you may be guided."" [Al-A'raaf (7):158]

Narrated Abu Wail:

'Abdullah used to give a religious talk to the people on every Thursday. Once a man said, "O Aba 'Abdur-Rahman! (By Allah) I wish if you could preach us daily." He replied, "The only thing which prevents me from doing so, is that I hate to bore you, and no doubt I take care of you in preaching by selecting a suitable time just as the Prophet used to do with us, for fear of making us bored." [The Book of Knowledge Volume 1, Book 3, Hadeeth 70]