Mukhtasar Muslim

Narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that a man asked the Noble Prophet (peace and blessings of Allah be upon him), "When will the Hour (Day of Judgment) be?" The Prophet (peace and blessings of Allah be upon him) remained silent for a while, then looked at a child from the tribe of Azd Shanu’ah who was sitting in front of him and said, "If this child lives long, he will not grow very old before your Hour will be established." Sayyiduna Anas (may Allah be pleased with him) said that this boy was my age on that day.