Musnad Ahmad 1153:1894

'Abd al-Razzaq narrated to us, he said: Hisham informed us, from Ibn Sirin, from 'Abd Allah ibn Shaqiq, he said: I asked 'A'ishah about the prayer of the Prophet, may Allah bless him and grant him peace. She said: "When the Messenger of Allah, may Allah bless him and grant him peace, prayed, he would pray standing." Then he mentioned the meaning of the hadith of Muhammad ibn Salamah.