Creator of Worlds
"O you who believe! do not enter the houses of the Prophet unless permission is given to you for a meal, not waiting for its cooking being finished-- but when you are invited, enter, and when you have taken the food, then disperse-- not seeking to listen to talk; surely this gives the Prophet trouble, but he forbears from you, and Allah does not forbear from the truth And when you ask of them any goods, ask of them from behind a curtain; this is purer for your hearts and (for) their hearts; and it does not behove you that you should give trouble to the Messenger of Allah, nor that you should marry his wives after him ever; surely this is grievous in the sight of Allah. " [Qur'an 33:53]
This verse screams to my theory that the Prophet was making this up as he needed to keep his people in line. It seems unlikely that Allah, the Creator of Worlds, to Whom belong all things in the heavens and on earth, He who is full of Wisdom and is acquainted with all things, could really care about the conduct of visitors to the Prophet's home and about the purity of his wives.