Good Manners and Form (Al-Adab)
Bukhari :: Book 8 :: Volume 73 :: Hadith 188
Narrated Anas:
A bedouin came to the Prophet and said, "O Allah's Apostle! When will The Hour be established?" The Prophet said, "Wailaka (Woe to you), What have you prepared for it?" The bedouin said, "I have not prepared anything for it, except that I love Allah and H is Apostle." The Prophet said, "You will be with those whom you love." We (the companions of the Prophet ) said, "And will we too be so? The Prophet said, "Yes." So we became very glad on that day. In the meantime, a slave of Al-Mughira passed by, and he was of the same age as I was. The Prophet said. "If this (slave) should live long, he will not reach the geriatric old age, but the Hour will be established."