Musnad Ahmad 32:1968

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, and Hajjaj narrated to us, he said: Shu'bah narrated to me, he said: I heard Qatadah narrating from Anas ibn Malik, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Three things, whoever possesses them will find the sweetness of faith: whoever loves a person and does not love him except for the sake of Allah; and whoever has Allah and His Messenger dearer to him than anything else; and whoever would rather be cast into the Fire than return to disbelief after Allah has saved him from it."