It is narrated from Umm al-Mu'mineen Sayyidah Aisha Siddiqa (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) performed prayer while sitting due to illness, and the people began to pray standing. Then the Prophet (peace and blessings be upon him) gestured to them to sit down. When he finished the prayer, he said: "The Imam is appointed so that he may be followed; therefore, when the Imam bows, you should also bow, and when the Imam raises his head, you should also raise your heads, and when the Imam performs prayer sitting, you should also perform prayer sitting."