The Qur’an is our guide that must be read everywhere and at all times. In the verse “And remember the signs of God and the wise words which are recited in your rooms…” (Surat al-Ahzab, 34) the Qur’an is described as always being read and its wisdom as always being borne in mind.
In another verse God describes the Qur’an in the words, “That is the Book, without any doubt. It contains guidance for those who have piety’’ (Surat al-Baqara, 2).
In order for a book to be a guide, people need to know the wisdom it contains. The verses of the Qur’an reveal that it is a guide, a light that illuminates the way, a measure that distinguishes truth from falsehood, evidence against those in rebellion, a miracle, medicine for those with spiritual sickness in their hearts, glad tidings for believers who are troubled, advice and a reminder for all people, a law that sets out all matters in detail, guidance that deepens reflection, an explanation of all things in various forms, a warning for those who use their intellect and a means for bringing people who are in dispute together.
Our Prophet (pbuh) governed on the basis of the Qur’an and lived by the Qur’an alone. Our Prophet (pbuh) has absolutely no authority to make anything lawful or unlawful outside the Qur’an, and because of his prophethood and powerful fear of God, he would in any case never do such a thing. Almighty God reveals in a verse that this attracts His wrath:
… this [the Qur’an] is the word of a noble messenger. It is not the word of a poet –how little faith you have! Nor the word of a fortune-teller –how little heed you pay! It is a revelation from the Lord of all the worlds. If he had made up any sayings and ascribed them to Us, We would have seized him by force, and then We would have cut off his life-blood and not one of you could have protected him. (Surat al-Haqqa, 40-47)
The Qur’an is an explanation of everything and has been preserved. As God reveals in one verse:
… This [the Qur’an] is not a narration which has been invented but confirmation of all that came before, a clarification of everything, and a guidance and a mercy for people who believe. (Surah Yusuf, 111)
As is clear from the verse, “O Prophet! Why do you make unlawful what God has made lawful for you, seeking to please your wives? God is Ever-Forgiving, Most Merciful” (Surat at-Tahrim, 1), our Prophet (pbuh) has no authority to make lawful things unlawful, even in his own private life.
In addition, God makes it clear in numerous verses, such as “Jurisdiction over it belongs to God alone” (Surat al-An‘am, 57) and “Nor does He share His rule with anyone” (Surat al-Kahf, 26) that He is the only source of commandments and jurisdiction. God’s commandments are in the Qur’an.
It is therefore impossible for our Prophet (pbuh) to issue a commandment that God has not issued.
In fact, the Qur'an is the only reliable source of Islam, for it is God's unaltered speech. God revealed the Qur'an so that humanity could read and understand it; acquire accurate knowledge of its Lord, Who created the universe from nothing; learn how to worship Him, and how to abide by His commands in order to earn His good pleasure. God explained His verses through examples and stories. As He makes clear in: "We have not neglected anything in the Book" (Surat al-An'am: 38), the Qur'an comprises everything. Numerous details pertaining to this world and the next are explained in the most intelligible way, for, as God informs us: "We have sent down the Book to you making all things clear and as guidance and mercy and good news for the Muslims"(Surat an-Nahl: 89).
The Qur'an is the Word of God, a guide for humanity that addresses everyone, and its commands are applicable to all times. Thus it must be the most important reference. An accurate perception of Islam and the correct understanding of its verses are essential for those who seek to be guided by it. In this respect, it is one of the most important duties of every Muslim who has wisdom, a conscience, and common sense to convey its message to all people.
Adnan Oktar's piece on Daily Mail:
http://dailymailnews.com/2015/02/22/muslims-should-always-consult-quran-as-their-sole-guide/