Shama'il Muhammadiyah #268

'A’isha said (may Allah be well pleased with her): “The Prophet (Allah bless him and give him peace) used to perform the ritual prayer sitting down, so he would also recite the Qur’an while he was seated. If the amount of his recitation remaining was thirty or forty verses, he would rise and recite standing up, and then he would bow and prostrate. Then he would do likewise in the second cycle.”