Musnad Ahmad 30:2114

Surayj ibn al-Nu‘man al-Lu’lu’i and Abu Kamil narrated to us, they said: Hammad ibn Salamah narrated to us, from Muhammad ibn Ziyad, Surayj said in his narration: I heard Abu Hurayrah saying: I heard Abu al-Qasim, may Allah bless him and grant him peace, saying: "By the One in Whose hand is my soul, men will surely depart from Medina, desiring to leave it, while Medina is better for them, if only they knew."