In one narration the words are: "The most excellent of people will be a believer who lives secluded in one of the mountain passes, fearing his Lord and keeping people safe from his evil."
Ahmad, al-Bazzar and al-Tabarani recorded this narration with various chains, and the narrators of one of them are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12346