Musnad Abu Ya'la al-Mawsili 130:33

Ja'far narrated to us, Abd al-Warith narrated to us, from Abd al-Aziz, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) went out for prayer, and a man encountered him and said: "O Messenger of Allah, when will the Hour be established?" He said: "And what have you prepared for it?" He said: "Nothing, except that I love Allah and His Messenger." He said: "Then you are with whom you love." When the Messenger of Allah (may Allah bless him and grant him peace) finished the prayer, he said: "Where is the one who asked about the Hour?" He said: So he came and stood up. He said: "O you." Anas said: And a boy from Daws—I and he are the same [in age]. The Messenger of Allah (may Allah bless him and grant him peace) said: "If this boy lives a long life, he will not die of old age until the Hour is established."