Tafsir Al-Jalalayn: Al-Ahzaab, Ayah 53

(O ye who believe! Enter not the dwellings of the Prophet for a meal) this verse was revealed concerning a group of believers who used to enter the rooms of the Prophet (pbuh) in the morning and evening and wait for the food to be served. They used to eat and speak with the wives of the Prophet (pbuh). The Prophet (pbuh) did not like this but felt shy of these believers and could not tell them to stop coming to his rooms without permission, or ask them to leave once they were inside. But Allah forbade them from this, saying: O believers, do not enter the rooms of the Prophet (pbuh) without permission from the Prophet to come and eat (without waiting for the proper time) for the food to be ready, (unless permission be granted you) to come in. (But if ye are invited, enter, and, when, your meal is ended) when you have finished eating, (then disperse) then leave. (Linger not for conversation) with the wives of the Prophet (pbuh). (Lo! That) coming in, sitting down and having conversation with the wives of the Prophet (pbuh) (would cause annoyance to the Prophet) Allah bless him and give him peace, (and he would be shy of (asking) you (to go)) or not to come in the first place; (but Allah is not shy of the Truth) Allah is not shy to command you to leave and not go in his rooms without his permission. (And when ye ask of them (the wives of the Prophet) anything) and when you speak with them, (ask it of them) speak with them (from behind a curtain. That is purer for your hearts and for their hearts) i.e. from doubts. (And it is not for you to cause annoyance to the Messenger of Allah) by entering his rooms without his permission and conversing with his wives, (nor that ye should ever marry his wives after him) after his death. This verse was revealed about Talhah Ibn 'Ubaydullah who had in mind to marry 'A'ishah after the death of the Prophet (pbuh). (Lo! That) your open declaration and intention to marry the Prophet's wives after his death (in Allah's sight would be an enormity) it is an enormous sin which merits severe punishment.