Musnad Ahmad 32:1443

Yunus and Hassan ibn Musa narrated to us, they said: Hammad ibn Salamah narrated to us, from Thabit al-Bunani, 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 called. When he finished his prayer, he said: "Where is the one who asked about the Hour?" The man said: "Here I am, O Messenger of Allah." He said: "And what have you prepared for it? For it is surely coming." 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: "You are with whom you love." He said: "The Muslims did not rejoice at anything after Islam more intensely than they rejoiced at this."