Those who said: one who prays sitting stands up when he bows

Hilal bin Yasaf said: Sometimes I pray sitting, and when I am about to bow, I stand up, recite a little, and then bow.

Sayyidah Aishah (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) used to pray the night prayer (tahajjud) standing. When he became advanced in age, he began to pray sitting, and when thirty or forty verses remained, he would stand and recite them, and then prostrate.

Sayyidah Aishah (may Allah be pleased with her) said: The Prophet (peace and blessings be upon him) used to pray sitting, and when thirty or forty verses of a surah remained, he would stand and recite them, and then bow.

Muhammad (Ibn Sirin) said: Whoever recites sitting bows and prostrates sitting as well, and whoever recites standing bows and prostrates standing as well. Al-Hasan said: He has the choice; he may do whichever he wishes.