Musnad Ahmad 1153:195

Isma'il narrated to us, Khalid al-Hadhdha' narrated to us, from Abu Qilabah, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, among the most complete of the believers in faith are those best of them in character, and the kindest of them to their family."