Musnad Abu Ya'la al-Mawsili 151:38

Muhammad ibn Abi Bakr narrated to us, Yahya narrated to us, from Ibn Jurayj, Sulayman ibn 'Atiq narrated to me, from Talq ibn Habib, from al-Ahnaf ibn Qays, from 'Abdullah, from the Prophet, may Allah bless him and grant him peace: "Beware, the extremists are ruined. Beware, the extremists are ruined. Beware, the extremists are ruined."