Acting according to the Sunnah and the ruling on opposing it

Q 2: Do the books of Hadith explain the Qur'an? Is it true that there is no Sunnan (supererogatory acts of worship following the example of the Prophet) in Islam and that a person has to adhere only to Faridah (obligatory acts)? Is it correct that to be saved from punishment in the Hereafter we have to abandon Sunnah (whatever is reported from the Prophet) and rely only on the Qur'an?

A: According to Ijma` (consensus of scholars), the purified Sunnah is the second source of evidence in Islam. The Sunnah explains the Qur'an. Anyone who denies the authority of the Sunnah is a Kafir (disbeliever) because they deny one of the agreed upon principles of Islam. Allah (Exalted be He) says: And whatsoever the Messenger (Muhammad صلى الله عليه وسلم) gives you, take it; and whatsoever he forbids you, abstain (from it). Allah (Glorified be He) also says: And We have also sent down unto you (O Muhammad صلى الله عليه و سلم) the Dhikr [reminder and the advice (i.e. the Qur’ân)], that you may explain clearly to men what is sent down to them. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.