Musnad Ahmad 30:3741

'Abdullah ibn al-Walid narrated to us, Sufyan narrated to us, from Salim, who said: I heard Abu Hazim saying: I was a witness on the day al-Hasan died—and he mentioned the story—and he said: Abu Hurayrah said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Whoever loves them both has loved me, and whoever hates them both has hated me."