The Almighty Allah says:
And We have revealed the Book to you which has clear explanation of everything, and a guidance, mercy and good news for those who submit. (An-Nahl 16: 89)
The Qur’an contains all the correct information about religion and is a guide for individuals. The Qur’an is complete without the Sunnah, yet no one can understand the Qur’an without returning to the explanation of the Prophet (peace be upon him).