Following the Sunnah leads to Jannah refusal leads to Hell

The Messenger of Allaah (sallallahu alaihi wa sallam) said: "Everyone will enter Jannah except those who refuse." It was asked, "And who would refuse, oh Messenger of Allaah?" He said, "Whoever obeys me enters Jannah, and whoever disobeys me, refuses."

[al-Bukhaaree (no. 2780)]

Al-Irbaad ibn Saariyah (radialahu 'anhu) reported: One day the Messenger of Allaah (sallallahu alaihi wa sallam) admonished us with an intense sermon which caused the hearts to fear and the eyes to shed tears, so we said: 'Oh Messenger of Allaah, this is as if it were a farewell sermon, so advise us.' He (sallallahu alaihi wa sallam) said: I order you to fear Allaah, and to hear and obey, even if you have a slave as a ruler over you. For verily, he who lives long among you will see many differences. So I order you to stick to my Sunnah and the Sunnah of the rightly-guided khulafa after me...

[Abu Dawood, Ahmad, Ibn Majaah, Ad-Daarimi, and at-Tirmidhee; Authentic]

Imaam Maalik (rahimahullaah) said: "The Sunnah is like Noah's Ark. Whoever embarks upon it reaches salvation and whoever refuses is drowned."

Reported by Shaikhul-Islaam Ibn Taymiyyah in Majmoo ul-Fataawaa (4/57)

Shaikh Muhammad Al-Anjaaree (hafidhahullaah) said "The life of the Sunnee revolves around the affair of him constantly reviving the Sunnah."