It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, sprained his blessed foot. He, peace and blessings be upon him, stayed in an upper chamber, whose staircase was made from tree trunks, and he, peace and blessings be upon him, took an oath from his wives for a month. The noble companions came to visit him, peace and blessings be upon him, for his care. He, peace and blessings be upon him, led them in prayer while sitting, and they were standing. When the time for the next prayer came, he, peace and blessings be upon him, said to them: Follow your Imam; so when he leads the prayer standing, you also pray standing, and if he leads the prayer sitting, you also pray sitting. When he, peace and blessings be upon him, came down from the upper chamber on the twenty-ninth day, the people said: O Messenger of Allah! You had taken an oath for a month? He, peace and blessings be upon him, said: This month is of twenty-nine days.