It is narrated from Hazrat Anas (may Allah be pleased with him) that when the command of veiling (purdah) was revealed, I know the circumstances of that time better than anyone else. That night, the Prophet (peace and blessings be upon him) was in seclusion with Hazrat Zainab (may Allah be pleased with her), and in the morning the Prophet (peace and blessings be upon him) was a bridegroom. After that, the Prophet (peace and blessings be upon him) invited people, they came, ate food, and left, but some people remained sitting there and stayed for quite a while until the Prophet (peace and blessings be upon him) himself got up and went outside. I also went outside so that they might leave as well, but they kept sitting. This happened repeatedly. Meanwhile, Hazrat Zainab (may Allah be pleased with her) was sitting in a corner. The Prophet (peace and blessings be upon him) felt shy to say anything to them regarding her. On this occasion, this verse was revealed: "O you who believe! Do not enter the houses of the Prophet unless you are invited for a meal," and do not wait for its preparation. But when you are invited, then enter. Then, at the command of the Prophet (peace and blessings be upon him), the curtain was drawn.