Musannaf Ibn Abi Shaybah

Hazrat Ubayy bin Ka'b said that it is necessary for you to adhere to the Sunnah and the correct path. Because there is no person who is on the Sunnah and the correct path, and whose eyes overflow with tears due to the fear of Allah, and then the fire of Hell touches him. And there is no person who is on the Sunnah and the correct path, and whose skin trembles out of fear of Allah, except that his example is like a tree that had dried up and was in that state when suddenly a wind blew and all its leaves fell off. In the same way, his sins fall away from him. Moderation is better in the Sunnah and the correct path; striving in anything other than the Sunnah and the correct path—just examine your deeds. If there is moderation and striving in them, then these deeds are indeed upon the way of the Prophets and their Sunnah.