Volume 1, Book 2, Number 25:
Narrated Abu Huraira:
Allah's Apostle was asked, "What is the best deed?" He replied, "To believe in Allah and His Apostle (Muhammad). The questioner then asked, "What is the next (in goodness)? He replied, "To participate in Jihad (religious fighting) in Allah's Cause."
Volume 1, Book 2, Number 35:
Narrated Abu Huraira:
The Prophet said, "The person who participates in (Holy battles) in Allah's cause and nothing compels him to do so except belief in Allah and His Apostles, will be recompensed by Allah either with a reward, or booty (if he survives) or will be admitted to Paradise (if he is killed in the battle as a martyr).
Volume 1, Book 10, Number 505:
Narrated 'Abdullah:
I asked the Prophet "Which deed is the dearest to Allah?" He replied, "To offer the prayers at their early stated fixed times." I asked, "What is the next (in goodness)?" He replied, "To be good and dutiful to your parents" I again asked, "What is the next (in goodness)?" He replied, 'To participate in Jihad (religious fighting) in Allah's cause."
Volume 2, Book 15, Number 86:
Narrated Ibn Abbas:
The Prophet said, "No good deeds done on other days are superior to those done on these (first ten days of Dhul Hijja)." Then some companions of the Prophet said, "Not even Jihad?" He replied, "Not even Jihad, except that of a man who does it by putting himself and his property in danger (for Allah's sake) and does not return with any of those things."
Volume 2, Book 24, Number 547:
Narrated Abu Huraira
Allah's Apostle (p.b.u.h) ordered (a person) to collect Zakat, and that person returned and told him that Ibn Jamil, Khalid bin Al-Walid, and Abbas bin 'Abdul Muttalib had refused to give Zakat." The Prophet said, "What made Ibn Jamll refuse to give Zakat though he was a poor man, and was made wealthy by Allah and His Apostle ? But you are unfair in asking Zakat from Khalid as he is keeping his armor for Allah's Cause (for Jihad).
Volume 2, Book 26, Number 594:
Narrated Abu Huraira:
The Prophet was asked, "Which is the best deed?" He said, "To believe in Allah and His Apostle." He was then asked, "Which is the next (in goodness)?" He said, "To participate in Jihad in Allah's Cause."
Volume 3, Book 29, Number 84:
Narrated Aisha (mother of the faithful believers):
I said, "O Allah's Apostle! Shouldn't we participate in Holy battles and Jihad along with you?" He replied, "The best and the most superior Jihad (for women) is Hajj which is accepted by Allah."
http://www.usc.edu/dept/MSA/reference/searchhadith.html