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In the Name of Allah, the Most Compassionate the Most Merciful
We have, Without doubt, sent down the message: and we will assuredly guard it (from corruption) (Qur'an 15:9)
The promise made by Allah(SWT) in Qur'an 15:9 is obviously fulfilled in the undisputed purity of the Qur'anic text throughout the fourteen centuries since its revelation. However, what is often forgotten by many Muslims is that the divine promise also includes, by necessity, the Sunnah of the Prophet(P), because the Sunnah is the practical example of the implementation of the Qur'anic guidance, the wisdom taught to the Prophet(P) along with the scripture, and neither the Qur'an nor the Sunnah can be understood correctly without the other.
Allah(SWT) preserved the Sunnah by enabling the Companions and those after them to memorize, write down and pass on the statements of the Prophet(P), and the descriptions of his way, as well as to continue the blessings of practicing the Sunnah.