Musnad Ahmad 32:819

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Mansur, from Salim ibn Abi al-Ja'd, who was narrating from Anas ibn Malik, that a man asked the Prophet, peace and blessings of Allah be upon him: "When is the Hour?" He said: "What have you prepared for it?" He said: "I have not prepared much for it in terms of prayer, fasting, or charity, except that I love Allah and His Messenger." He said: "Then you are with whom you love."