An-Nur · 24:61

61. There is no sin upon the blind who has lost his eyesight, nor upon the lame nor the sick if they leave those responsibilities they can no longer fulfil, i.e. jihad in the way of Allah. O believers! There is no sin upon you in eating from your own homes or the homes of sons, nor in eating from the homes of your fathers, mothers, brothers, sisters, paternal uncles and aunts nor maternal uncles and aunts, nor those houses which you have been entrusted with safeguarding, i.e. garden-keeper. There is also no sin in eating at the house of your friend as is customary to please him. It is not a problem whether you eat alone or together in groups. So when you do enter any houses like the ones mentioned above or any others, greet those within them with peace by saying: “Peace be upon you”, and if there is no one inside them, then greet yourselves by saying: “Peace be upon us and the pious servants of Allah”. This is a blessed greeting from Allah; He has legislated it for you because of the love and affection it spreads among you. It is also a pleasant greeting in that it pleases the soul of the one who hears is Just like the aforementioned clarity in this Sūrah, Allah clearly explains His verses in the hope that you will implement whatever they contain.