Sahih al-Bukhari 2041

Muhammad narrated to us: Muhammad ibn Fudayl ibn Ghazwan informed us, from Yahya ibn Saeed, from Amra bint Abd al-Rahman, from Aisha, may Allah be pleased with her, who said: The Messenger of Allah, peace and blessings be upon him, used to observe retreat in the mosque every Ramadan. After praying the dawn prayer, he would enter the place where he was observing retreat. Aisha asked his permission to observe retreat, and he gave her permission, so she set up a tent there. Hafsa heard about it and set up a tent, and Zaynab heard about it and set up another tent. The next morning, when the Messenger of Allah had finished prayer, he saw four tents and asked, “What is this?” He was told what had happened. He said, “What prompted them to do this? Is it piety? Take them down; I do not wish to see them.” They were taken down. He did not observe retreat in Ramadan again until he observed it during the last ten days of Shawwal.