Musnad Ahmad 30:2112

Ahmad ibn Abd al-Malik narrated to us, Muhammad ibn Salamah narrated to us, from Muhammad ibn Ishaq, from Muhammad ibn Ibrahim, from Abu Salamah, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Shall I not inform you of the best among you?" They said: "Yes, O Messenger of Allah." He said: "The best among you are those of you with the longest lives and the best of you in character."