When the Messenger of Allah (PBUH) wanted to observe i'tikaf (ritual seclusion), he would pray the morning prayer and then enters the place where he wanted to observe it. So, he wanted to observe i'tikaf during the last ten days of Ramadan, so he ordered that a tent be pitched for him, also 'A'ishah ordered that a tent be pitched for her, then Hafsa did the same. When Zeinab saw their tents, she also ordered that a tent be pitched for her. When the Messenger of Allah (PBUH) saw this he said: Is it righteousness that you seek?! then he did not observe i'tikaf in that Ramadan, but observed it for ten days in next Shawwal.