In the Name of Allaah, the Most Gracious, the Most Merciful
All praise and thanks be to Allaah Who sent down to His Servant Muhammad the Qur’aan and has not placed therein any deviance. He made it straight to warn of severe punishment from Him and to give good tidings to the believers who do righteous deeds that they will receive a good reward in which they shall abide forever. And to warn those who say: “Allaah has begotten a son.” Blessed be He Who sent down the criterion of right and wrong to His Servant Muhammad so that he may be a warner to the world. May peace and blessings be upon our Prophet Muhammad who was sent with guidance and mercy as a bearer of glad tidings and a warner and one who invites others to Allaah by His Leave, and a lamp spreading light. May peace and blessings be upon him, his family, his Companions, and those who follow their path until the Day of Recompense.
Allaah (Glorified be He) conferred a favor upon His creation, especially the believers, by sending to them His Honorable Prophet Muhammad (peace be upon him) and sending down to them the best and last of His Books; that is trustworthy, sublime, and a witness over the previously revealed Books. Allaah (Glorified and Exalted be He) states: Indeed Allaah conferred a great favour on the believers when He sent among them a Messenger (Muhammad صلى الله عليه وسلم) from among themselves, reciting unto them His Verses (the Qur’aan), and purifying them (from sins by their following him), and instructing them (in) the Book (the Qur’aan) and Al-Hikmah [the wisdom and the Sunnah of the Prophet صلى الله عليه وسلم (i.e. his legal ways, statements, acts of worship)], while before that they had been in manifest error.
It is reported by Muslim in his Saheeh on the authority of ‘Iyad ibn Himar Al-Mujaashi` that the Messenger of Allah (peace be upon him) said in a Khutbah (sermon)… read more here.