Musnad Ahmad 32:2129

'Affan narrated to us, Hammad narrated to us, he said: Thabit informed us, from Anas, that a man asked the Messenger of Allah, peace and blessings of Allah be upon him, about the establishment of the Hour, and the prayer was established. When he finished his prayer, he said: "Where is the one who asked about the Hour?" The man said: "I am, O Messenger of Allah." He said: "What have you prepared for it? For it is established." He said: "I have not prepared much work for it, except that I love Allah and His Messenger." The Messenger of Allah, peace and blessings of Allah be upon him, said: "Then you are with whom you love." He said: "The Muslims did not rejoice at anything after Islam as they rejoiced at this hadith." He said: So Anas used to say: "And we love Allah and His Messenger."