Assalam-u-Alaikum Wa Rahmatullahi Wa Barakatuhu,
[29. Surah Al-'Ankabut : Ayah 45]
Recite that which has been revealed to you of the Book and keep up prayer; surely prayer keeps (one) away from indecency and evil, and certainly the remembrance of Allah is the greatest, and Allah knows what you do.
Significance of Salam (Peace)
Peace - A greeting of blessing and purity from Allah
[24. Surah An-Nur : Ayah 61]
So when you enter houses, greet your people with a salutation from Allah, blessed (and) goodly; thus does Allah make clear to you the communications that you may understand.
[6. Surah Al-An'am : Ayah 54]
And when those who believe in Our communications come to you, say: Peace be on you, your Lord has ordained mercy on Himself, (so) that if any one of you does evil in ignorance, then turns after that and acts aright, then He is Forgiving, Merciful.
Quranic Places where Allah paid Salam (Peace) to his Prophets
[37. Surah As-Saffat : Ayah 109]
Peace be on Ibrahim (alaihi salaam).
[37. Surah As-Saffat : Ayah 120]
Peace be on Musa (alaihi salaam) and Haroun (alaihi salaam).
[37. Surah As-Saffat : Ayah 130]
Peace be on Ilyas (alaihi salaam).
[37. Surah As-Saffat : Ayah 181]
And peace be on the apostles.
[36. Surah Ya-Sin : Ayah 58]
Peace: a word from a Merciful Lord.
[56. Surah Waqia : Ayah 25]
They shall not hear therein vain or sinful discourse.
[56. Surah Waqia : Ayah 26]
Except the word peace, peace.
Dealing with Illiterate People
[43. Surah Az-Zukhruf : Ayah 88-89]
Consider his cry: O my Lord! surely they are a people who do not believe. So turn away from them and say, Peace, for they shall soon come to know.
[28. Surah Al-Qasas : Ayah 55]
And when they hear idle talk they turn aside from it and say: We shall have our deeds and you shall have your deeds; peace be on you, we do not desire the ignorant.
[Sahih Bukhari : Volume 2, Book 2, Number 10]
Narrated 'Abdullah bin 'Amr (Radi Allah Anhu): A man asked the Prophet Muhammad (sal-allahu- alleihi-wasallam ), "Whose Islam is good or what sort of deeds (or what qualities) of Islam are good." The Prophet replied, "To feed (others) and to greet those whom you know and those whom you don not know."