053.003 Nor does he say (aught) of (his own) Desire.
053.004 It is no less than inspiration sent down to him:
Al-Qur’an, 053.003-004
Here it is clear that what Prophet says is not less than inspiration sent down to him by ALLAH.
And Obey ALLAH and the messenger, that ye may find mercy (Quran 3:132)
So again it is clear that along obeying ALLAH obey Prophet Muhammad (PUBH) also
“And whatsoever the Messenger allows you to do, do it. And whatsoever he forbids, abstain (from it.)” (Quran 59:7)
Again it is not said here that what ALLAH allows you to do instead it is mentioned that what messenger say which means here Quran is talking about Hadith and Sunnah
“Say: ‘Obey Allah, and obey the Messenger. but if ye turn away, he is only responsible for the duty placed on him and ye for that placed on you. If ye obey him, ye shall be on right guidance. The Messenger’s duty is only to preach the clear (Message).’” (Quran 24:54)
“O ye who believe! Obey Allah and obey the Messenger and make not vain your deeds!” (Quran 47:33)
Again and again it is said that obey ALLAH and Messenger at same time and from where we get the orders of Prophet (PUBH) from ?? Answer Hadith and Sunnah
“We have revealed unto you the Remembrance that you may explain to mankind that which has been revealed for them” (16: 44)
YUSUFALI: (We sent them) with Clear Signs and Books of dark prophecies; and We have sent down unto thee (also) the Message; that thou mayest explain clearly to men what is sent for them, and that they may give thought. (Quran)
It is clear here that word EXPLAIN is use not Tell. So it is given in Quran that say Salat and perform Haj do Fasting, Pay Zakat but its Prophet Muhammad (PUBH) who explains how to do it. Its all from hadith and sunnah
YUSUFALI: Ye have indeed in the Messenger of Allah a beautiful pattern (of conduct) for any one whose hope is in Allah and the Final Day, and who engages much in the Praise of Allah (Quran 33:21)
Again Quran is asking us to follow Prophet Muhamma (PUBH).
Conclusion:
From above mentioned verses of Quran it is clear that Hadith and Sunnah are important for muslim to be a prefect andbetter muslim and Allah have asked us to follow Prophet Muhammad (PUBH) and obey what he said.
All proves were given from the Holy Quran