Islaam is the Sunnah, and the Sunnah is Islaam
The author (Imaam al-Barabahaaree) may Allah have Mercy on him stated:
"Know that Islaam is the Sunnah and the Sunnah is Islaam and neither of them can be established without the other."
Explanation (Shaykh Rabee' bin Hadee al-Madkhalee, may Allah preserve