9:81. Those who stayed away (from Tabuk expedition) rejoiced in their staying behind the Messenger of Allâh; they hated to strive and fight with their properties and their lives in the Cause of Allâh, and they said: "March not forth in the heat." Say: "The Fire of Hell is more intense in heat", if only they could understand!
Narrated Abu Said Al-Khudri:
Somebody asked, "O Allah's Apostle! Who is the best among the people?" Allah's Apostle replied "A believer who strives his utmost in Allah's Cause with his life and property." They asked, "Who is next?" He replied, "A believer who stays in one of the mountain paths worshipping Allah and leaving the people secure from his mischief."
Narrated Abu Huraira:
I heard Allah's Apostle saying, "The example of a Mujahid in Allah's Cause-- and Allah knows better who really strives in His Cause----is like a person who fasts and prays continuously. Allah guarantees that He will admit the Mujahid in His Cause into Paradise if he is killed, otherwise He will return him to his home safely with rewards and war booty."
Narrated Anas bin Malik:
The Prophet said, "A single endeavor (of fighting) in Allah's Cause in the forenoon or in the afternoon is better than the world and whatever is in it."
Narrated Abu Musa:
A man came to the Prophet and asked, "A man fights for war booty; another fights for fame and a third fights for showing off; which of them fights in Allah's Cause?" The Prophet said, "He who fights that Allah's Word (i.e. Islam) should be superior, fights in Allah's Cause."
61:4. Verily, Allâh loves those who fight in His Cause in rows (ranks) as if they were a solid structure .
8:38. Say to those who have disbelieved, if they cease (from disbelief) their past will be forgiven. But if they return (thereto), then the examples of those (punished) before them have already preceded (as a warning).
8:39. And fight them until there is no more Fitnah (disbelief and polytheism: i.e. worshipping others besides Allâh) and the religion (worship) will all be for Allâh Alone [in the whole of the world ]. But if they cease (worshipping others besides Allâh), then certainly, Allâh is All-Seer of what they do.