Musnad Ahmad 1153:346

Yunus and Abu al-Nadr narrated to us, they said: al-Layth narrated to us, from Yazid ibn Abdullah ibn Usamah, from Amr ibn Abi Amr, from al-Muttalib, from Aisha, who said: I heard the Prophet, peace and blessings of Allah be upon him, saying: "Indeed, the believer attains, by his good character, the degrees of the one who stands in prayer at night and fasts during the day."