The Prophet (sallallaahu 'alaihi wasallam) was asked, "Which is the best deed?"
He said, "To believe in Allah and His Messenger."
He was then asked, "Which is the next (in goodness)?"
He said, "To participate in Jihad in Allah's cause."
He was then asked, "Which is the next?" He said, "To perform Hajj-Mabrur."

Hajj-Mabrur:
Hajj performed in accordance with the Prophet's tradition without committing sins and accepted by Allah.

Rasulullah S.A.W. said,
"Jannat lies under the feet of your mother."

Rasulullah S.A.W. said,
"A women who reveals her body or even wears tight fitting clothes wont come within 500 years of the smell of Jannah."

Rasulullah S.A.W. said,
"The dust which settles on a man while he is out in the path of Allah; not only the fire, but the smoke of Jahannam is haraam for those parts of the body."

Rasulullah S.A.W. said,
"I only curse 3 types of people;
1. Those people who do not look after their parents when they are in old age.
2. Those people who do not take full advantage of the blessed month of Ramadan.
3. Those people who don not say, 'Salallahu -Alayhay- -Wa-Aalahay Wasallam' when my name is mentioned."

Rasulullah S.A.W said,
"An intelligent person is one who is constantly thinking about and preparing for death."

hadith of prophet S.A.W not exactly word to word
on the day of resoruction when everyone will be gathered, no body will be allowed to move before he or she answers five questions and those are,

1- how did we spent our lives??
2- how did we spend our youth(jawanee)?
3- how did we earn money ?
4- where did we spent it?
5- and fifth will be did we tried to get any knowledge (ilm) and if yes, did we benefit from it ?