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"O you who believe! Let your legal slaves and slave-girls, and those among you who have not come to the age of puberty ask your permission (before they come to your presence) on three occasions; before Fajr (morning) prayer, and while you put off your clothes for the noonday (rest), and after the 'Ishaa' (late-night) prayer, (These) three times are of privacy for you, other than these times there is no sin on you or on them to move about, attending (helping) you each other, Thus Allaah makes clear the Ayaat (the Verses of this Qur'aan, showing proofs for the legal aspects of permission for visits, etc.) to you, And Allaah is All-Knowing, All-Wise." [An-Noor (24):58]

Narrated Abu Musa:

The Prophet said, "The example of guidance and knowledge with which Allah has sent me is like abundant rain falling on the earth, some of which was fertile soil that absorbed rain water and brought forth vegetation and grass in abundance. (And) another portion of it was hard and held the rain water and Allah benefited the people with it and they utilized it for drinking, making their animals drink from it and for irrigation of the land for cultivation. (And) a portion of it was barren which could neither hold the water nor bring forth vegetation (then that land gave no benefits). The first is the example of the person who comprehends Allah's religion and gets benefit (from the knowledge) which Allah has revealed through me (the Prophets and learns and then teaches others. The last example is that of a person who does not care for it and does not take Allah's guidance revealed through me (He is like that barren land.)" [The Book of Knowledge Volume 1, Book 3, Hadeeth 79]