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.

24:61There is no blame on the blind, nor any blame on the lame, nor any blame on the sick, nor on yourselves for eating at your homes, or your fathers’ homes, or your mothers’ homes, or your brothers’ homes, or your sisters’ homes, or the homes of your paternal uncles, or the homes of your paternal aunts, or the homes of your maternal uncles, or the homes of your maternal aunts, or those whose keys you own, or the homes of your friends. You commit no wrong by eating together or separately. But when you enter any home, greet one another with a greeting from God, blessed and good. God thus explains the revelations for you, so that you may understand.