Musnad Ahmad 32:1214

Aswad ibn Amir narrated to us, Abu Bakr ibn Ayyash informed us, from Mansur, from Salim ibn Abi al-Ja’d, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) came walking until he reached the mosque, near to it. He said: An old man, or a man, came to him and said: "When is the Hour, O Messenger of Allah?" He said: "And what have you prepared for it?" The man said: "By the One who sent you with the truth, I have not prepared for it much prayer nor fasting, but I love Allah and His Messenger." He said: "Then you are with whom you love."