9.20 Those who believe and suffer exile and strive with might and remain in Allah’s cause with their goods and their persons have the highest rank in the sight of Allah: They are the people who will achieve salvation.
Holy Quran – Surah At Tauba – Ayah 20
Here is a good description of Jihad Fi’Sabeel’Allah.
It may require fighting in Allah’s cause, its a form of self-sacrifice. But its essence consists in;
(1) a true and sincere Faith, which so fixes its gaze on Allah, that all selfish or worldly motives seem paltry and fade away, and
(2) an earnest and ceaseless activity, involving the sacrifice (if need be) of life, person, or property, in the service of Allah.
Mere brutal fighting is opposed to the whole spirit of Jihad, while the sincere scholar’s pen or preacher’s voice or wealthy man’s contributions may be the most valuable forms of Jihad.