24:27O you who believe! Do not enter homes other than your own, until you have asked permission and greeted their occupants. That is better for you, that you may be aware.

24:59When the children among you reach puberty, they must ask permission, as those before them asked permission. God thus clarifies His revelations for you. God is Knowledgeable and Wise.

24:62The believers are those who believe in God and His Messenger, and when they are with him for a matter of common interest, they do not leave until they have asked him for permission. Those who ask your permission are those who believe in God and His Messenger. So when they ask your permission to attend to some affair of theirs, give permission to any of them you wish, and ask God’s forgiveness for them. God is Forgiving and Merciful.