Prayer of the Sick, the Unconscious, the Weak and the Infirm, the Elderly and Others

Hamad ibn Othman said: I said to Imam Jafar ibn Muhammad Al-Sadiq عليه السلام: 'The standing in prayer has become very difficult for me.' He عليه السلام replied: 'When you want to catch the prayer of the one standing, recite while sitting. When there remain two verses of the surah, then stand up and complete the remaining part, and bow and prostrate. That is the prayer of the one standing.'"