Musannaf Ibn Abi Shayba 33:197

Ja'far ibn 'Awn narrated to us, from Muhammad ibn Ishaq, from Muhammad ibn Ibrahim, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The best of you are those of you who are longest in age and best of you in deeds."