The following are some of the verses that deal with etiquette in our daily life.

[24:27] O you who believe, do not enter homes other than yours without permission from their inhabitants, and without greeting them. This is better for you, that you may take heed.

[4:86] When greeted with a greeting, you shall respond with a better greeting or at least an equal one. GOD reckons all things.

[6:54] When those who believe in our revelations come to you, you shall say,"Salmun `Alaykum (Peace be upon you). ���.

[ 73:10] And remain steadfast in the face of their utterances, and disregard them in a nice manner.

[31:18-19] "You shall not treat the people with arrogance, nor shall you roam the earth proudly. GOD does not like the arrogant showoffs. "Walk humbly and lower your voice - the ugliest voice is the donkey's voice."

[4:148] GOD does not like the utterance of bad language, unless one is treated with gross injustice. GOD is Hearer, Knower.

[7:31] O children of Adam, you shall be clean and dress nicely when you go to the masjid. And eat and drink moderately; Surely, He does not love the gluttons.

[49:11] O you who believe, no people shall ridicule other people, for they may be better than they. Nor shall any women ridicule other women, for they may be better than they. Nor shall you mock one another, or make fun of your names. Evil indeed is the reversion to wickedness after attaining faith. Anyone who does not repent after this, these are the transgressors.

[49:12] O you who believe, you shall avoid any suspicion, for even a little bit of suspicion is sinful. You shall not spy on one another, nor shall you backbite one another; this is as abominable as eating the flesh of your dead brother. You certainly abhor this. You shall observe GOD. GOD is Redeemer, Most Merciful.

[14:24-25] Do you not see that GOD has cited the example of the good word as a good tree whose root is firmly fixed, and its branches are high in the sky? It produces its crop every season, as designed by its Lord. GOD thus cites the examples for the people, that they may take heed.

[14:26] And the example of the bad word is that of a bad tree chopped at the soil level; it has no roots to keep it standing.

[41:34] Not equal is the good response and the bad response. You shall resort to the nicest possible response. Thus, the one who used to be your enemy, may become your best friend.

[29:46] Do not argue with the people of the scripture (Jews, Christians, and Muslims) except in the nicest possible manner - unless they transgress - and say, "We believe in what was revealed to us and in what was revealed to you, and our god and your god is one and the same; to Him we are submitters."

[58:11] O you who believe, if you are told, "Please make room," you shall make room for each other to sit. GOD will then make room for you. If you are asked to get up and move, get up and move. GOD raises those among you who believe, and those who acquire knowledge to higher ranks. GOD is fully Cognizant of everything you do.

[17:23] Your Lord has decreed that you shall not worship except Him, and your parents shall be honored. As long as one or both of them live, you shall never say to them, "Uff" (the slightest gesture of annoyance), nor shall you shout at them; you shall treat them amicably.

[17:28] Even if you have to turn away from them, as you pursue the mercy of your Lord, you shall treat them in the nicest manner.

[ 2:263] Kind words and compassion are better than a charity that is followed by insult. GOD is Rich, Clement.

[2:264] O you who believe, do not nullify your charities by inflicting reproach and insult, like one who spends his money to show off, while disbelieving in GOD and the Last Day. His example is like a rock covered with a thin layer of soil; as soon as heavy rain falls, it washes off the soil, leaving it a useless rock. They gain nothing from their efforts. GOD does not guide disbelieving people.

[24:58] O you who believe, permission must be requested by your servants and the children who have not attained puberty (before entering your rooms). This is to be done in three instances - before the Dawn Prayer, at noon when you change your clothes to rest, and after the Night Prayer. These are three private times for you. At other times, it is not wrong for you or them to mingle with one another. GOD thus clarifies the revelations for you. GOD is Omniscient, Most Wise.

[17:53] Tell My servants to treat each other in the best possible manner, for the devil will always try to drive a wedge among them. Surely, the devil is man's most ardent enemy.

[24:61] ........When you enter any home, you shall greet each other a greeting from GOD that is blessed and good. GOD thus explains the revelations for you, that you may understand.

[24:15,16] You fabricated it with your own tongues, and the rest of you repeated it with your mouths without proof. You thought it was simple, when according to God,gross. when you heard it, you should have said,"we will not repeat this.Glory be to You.This is a gross falshood.

[24:22] Those among you who are blessed with resources and wealth shall be charitable towards their relatives, the poor, and those who have immigrated for the sake of God. They shall treat them with kindness and tolerance; do you not love to attain God's forgiveness? God is Forgiver, Most Merciful.

[28:55] When they come across vain talk, they disregard it and say, "We are responsible for our deeds, and you are responsible for your deeds. Peace be upon you. We do not wish to behave like the ignorant ones."

[16:125] You shall invite to the path of your Lord with wisdom and kind enlightenment, and debate with them in the best possible manner. Your Lord knows best who has strayed from His path, and He knows best who are the guided ones.

[4:94] O you who believe, if you strike in the cause of GOD, you shall be absolutely sure. Do not say to one who offers you peace, "You are not a believer," seeking the spoils of this world. For GOD possesses infinite spoils. Remember that you used to be like them, and GOD blessed you. Therefore, you shall be absolutely sure (before you strike). GOD is fully Cognizant of everything you do.

[16:126] And if you punish, you shall inflict an equivalent punishment. But if you resort to patience (instead of revenge), it would be better for the patient ones.

[16:94] Do not abuse the oaths among you, lest you slide back after having a strong foothold, then you incur misery. Such is the consequence of repelling from the path of GOD (by setting a bad example); you incur a terrible retribution.

(See also 2;177. It deals with keeping promises).

[17:38] All bad behaivor is condemned by your Lord

 A very good post. Please remember that most of these good words of advice  (instructions) are for the believers (Momineen). There is none of these for the muslims. That is an important point which should be kept in mind. We are definitely believers. So they apply to all of us. Thanks for quoting.