Musnad Ahmad 1153:964

'Affan narrated to us, he said: Al-Kirmani Hassan bin Ibrahim narrated to us, he said: Sa'id bin Masruq narrated to us, from Yusuf bin Abi Burdah bin Abi Musa al-Ash'ari, from Abi Burdah, he said: I came to 'Aisha and said: "O my mother, tell me something you heard from the Messenger of Allah, may Allah bless him and grant him peace." She said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Birds fly according to destiny." And he used to like good omens.