Musannaf Ibn Abi Shayba 27:771

Husayn ibn Ali narrated to us, from Za'idah, from al-Suddi, from Abdullah al-Bahiy, from Aisha, who said: A man asked the Messenger of Allah, peace and blessings of Allah be upon him, "Which of the people are best?" He said, "The generation in which I am, then the second, then the third."