Musnad Ahmad 32:880

'Abd al-Malik narrated to us, Hisham narrated to us, from Qatadah, from Anas, who said: A man—or a Bedouin—came to the Prophet, peace and blessings of Allah be upon him, and said: "O Messenger of Allah, when is the Hour?" He said: "And what have you prepared for it?" He said: "I have not prepared much for it, except that I love Allah and His Messenger." He said: "You are with whom you love." Anas said: "I have never seen the Muslims rejoice over anything after Islam as much as they rejoiced on that day."