Musnad Abu Ya'la al-Mawsili 152:174

Abu Khaythama narrated to us, Yahya bin Sa'id narrated to us, from Ibn Jurayj, he said: Sulayman bin 'Atiq informed me, from Talq bin Habib, from al-Ahnaf bin Qays, from 'Abdullah bin Mas'ud, from the Prophet (peace and blessings of Allah be upon him), he said: "The extremists have perished," (repeated) three times.