In the name of Allah, the Most-Merciful, the All-Compassionate 
"May the Peace and Blessings of Allah be Upon You"
Praise be to Allaah, we seek His help and His forgiveness. We seek refuge with Allaah from the evil of our own souls and from our bad deeds. Whomsoever Allaah guides will never be led astray, and whomsoever Allaah leaves astray, no one can guide. I bear witness that there is no god but Allaah, and I bear witness that Muhammad is His slave and Messenger.
Bismillah Walhamdulillah Was Salaatu Was Salaam 'ala Rasulillah
As-Salaam Alaikum Wa-Rahmatullahi Wa-Barakatuhu
Islam has encouraged the custom of greetings among the members of Society because it leads to love and friendship. This is supported by the Prophet (pbuh), saying which meaning of is translated as: "You will never enter Paradise until you become believers, and you will not become believers until you love each other. Shall I guide you to something that makes you love each other? Spread greetings with peace among you." (Muslim).
Ethics of Sitting
Greet attendants of the meeting or gathering, as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "If one comes to a meeting he should say: Assalamu Alaykum! (i.e. Peace be upon you!) and on leaving he should do the same, for the first greeting is not more important than the latter." (Abu Dawood and Tirmidhi).
It is not appropriate to ask someone to leave his sitting place for someone else as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "Never should anyone of you make someone rise from his place and sit in his place rather, make more room for others to sit." (Bukhari and Muslim). "If someone leave his sitting place then returns to it, he will have more right to it" as stated by the Holy Prophet, peace be upon him, (Muslim).
Never separate two persons sitting as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "It is not permissible for a man to separate two men (by inserting himself sitting between them) unless they give permission." (Abu Dawood and Tirmidhi).
Never talk to a friend privately in the presence of a third person as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "If there are three of you, never should two of them talk without the third until you mix with other people, for this would grieve the third." (Bukhari).
Never sit in the middle of a circle or group of people, as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "Damned is he who sits in the middle of a sitting group." (Abu Dawood).
Leave space for others to sit, Allah said which meaning of is translated as: "O you who believe! When it is said, Make room! In assemblies, then make room; Allah will make way for you (hereafter). And when it is said, Come up higher! Go up higher; Allah will exalt those who have knowledge, to high ranks. Allah is Well-Aware of what you do." (The Quraan, Chapter Az-Zukhruf, 43:11).
It is desirable to suppress yawning as far as possible as it is a sign of laziness, as pointed out in the Prophet (pbuh), saying which meaning of is translated as: "Yawning is from Satan, so when one of you yawns let him try to repel it as far as possible, for if one utters "Ha" (when yawning) the devil will laugh at him." (Bukhari and Muslim).
About sneezing, the Holy Prophet (pbuh), said which meaning of is translated as: "If one of you sneezes, let him say: Praise be to Allah! And his Muslim brother should say to him: May Allah have mercy on you! Upon which he answers: May Allah guide you and make you well." (Bukhari).
It is also advisable for a person, as stated by Allahs Messenger (pbuh), said which meaning of is translated as: "on sneezing; to cover his mouth with his hand or garment and suppress his voice." (Abu Dawood and Tirmidhi).
Avoid belching (burping) while sitting in the presence of others. According to Ibn Umar, may Allah be pleased with him and his father, one man belched in the presence of Allahs Messenger (pbuh), said to him which meaning of is translated as: "stop belching, The biggest eaters in this worldly life will be the hungriest in the Hereafter." (Tirmidhi and Ibin Majah).
A person should not face those sitting with him with what they dislike.
Islam respects the feeling of people who gather at a place to make gathering desirable and repel all that cause people to hate gathering. Therefore, Islam instructs its followers to be clean-bodied, with no bad smell, and clean-dressed, with no disgusting sights. It also instructs them to listen to the speaker without interrupting him and to sit where they find room without stepping over peoples neck or causing them any inconvenience by pressing against them.
This is supported by the Prophet (pbuh), saying while addressing Muslims during Friday sermon which meaning of is translated as: "Whoever has a bath on Friday, puts on the best of his clothes, puts some scent on if any, then attends Friday prayer without crossing over peoples necks and performs whatever rakats he could. Then keep quiet when the Imam mounts the pulpit until he concludes prayer. His prayer will be an atonement for the whole week preceding that prayer." (Abu Dawood).
