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"O you who believe! Enter not the Prophet's houses, except when leave is given to you for a meal, (and then) not (so early as) to wait for its preparation, But when you are invited, enter, and when you have taken your meal, disperse, without sitting for a talk, Verily, such (behaviour) annoys the Prophet, and he is shy of (asking) you (to go), but Allaah is not shy of (telling you) the truth, And when you ask (his wives) for anything you want, ask them from behind a screen, that is purer for your hearts and for their hearts, And it is not (right) for you that you should annoy Allaah's Messenger, nor that you should ever marry his wives after him (his death), Verily! With Allaah that shall be an enormity." [Al-Ahzaab (33):53]

Narrated Ibn 'Umar:

Allah's Apostle said, "While I was sleeping, I saw that a cup full of milk was brought to me and I drank my fill till I noticed (the milk) its wetness coming out of my nails. Then I gave the remaining milk to 'Umar Ibn Al-Khattab" The companions of the Prophet asked, "What have you interpreted (about this dream)? "O Allah's Apostle ,!" he replied, "(It is religious) knowledge." [The Book of Knowledge Volume 1, Book 3, Hadeeth 82]