Sayyidah Aishah (may Allah be pleased with her) says: The Messenger of Allah (peace and blessings be upon him) used to pray both standing and sitting. When he (peace and blessings be upon him) began the prayer standing, he also bowed standing, and when he began the prayer sitting, he also bowed sitting. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it with this wording. I have previously recorded the hadith of Abdullah bin Shaqiq from Aishah through the narration of Humayd, and this hadith of Ibn Sirin is a sahih supporting witness (shahid) for what preceded.