The Prophet Muhammad (Peace be upon him) has declared in the last sermon day that we should be closely tightened with two books – Al Quran and Hadith.
Verily your blood, your property are as sacred and inviolable as the sacredness of this day of yours, in this month of yours, in this town of yours. Behold! Everything pertaining to the Days of Ignorance is under my feet completely abolished. Abolished are also the blood-revenges of the Days of Ignorance. The first claim of ours on blood-revenge which I abolish is that of the son of Rabi’a b. al-Harith, who was nursed among the tribe of Sa’d and killed by Hudhail. And the usury of the pre-Islamic period is abolished, and the first of our usury I abolish is that of ‘Abbas b. ‘Abd al-Muttalib, for it is all abolished. Fear Allah concerning women! Verily you have taken them on the security of Allah, and intercourse with them has been made lawful unto you by words of Allah. You too have right over them, and that they should not allow anyone to sit on your bed whom you do not like. But if they do that, you can chastise them but not severely. Their rights upon you are that you should provide them with food and clothing in a fitting manner. I have left among you the Book of Allah, and if you hold fast to it, you would never go astray. And you would be asked about me (on the Day of Resurrection), (now tell me) what would you say? They (the audience) said: We will bear witness that you have conveyed (the message), discharged (the ministry of Prophethood) and given wise (sincere) counsel. He (the narrator) said: He (the Holy Prophet) then raised his forefinger towards the sky and pointing it at the people (said): “O Allah, be witness. O Allah, be witness,” saying it thrice.Sahih Muslim Book 15, Hadith 159