Musnad Ahmad 1153:1311

'Abd al-Razzaq narrated to us, he said: Sufyan informed us, from Ayyub al-Sakhtiyani, from Ibn Sirin, from 'Abd Allah ibn Shaqiq al-'Uqayli, from 'A'ishah, she said: "The Prophet, may Allah bless him and grant him peace, would pray a long night standing, and a long night sitting." He said: I said: "How would he do?" She said: "When he recited while standing, he would bow while standing, and when he recited while sitting, he would bow while sitting."