Musnad Ahmad 5:169

Waki' narrated to us, al-A'mash narrated to us, from 'Adi ibn Thabit, from Zirr ibn Hubaysh, from 'Ali, who said: The Prophet, may Allah bless him and grant him peace, made a covenant with me: "None loves you except a believer, and none hates you except a hypocrite."