Muhammad was the founder of Islam and it says 91 times in Islam's most sacred book, the Koran, that all Muslims should follow his example. How did Muhammad feel about fighting jihad?
"...the Prophet of Islam repeatedly emphasized that there was nothing better his followers could do than engage in jihad warfare. When a Muslim asked him to name the "best deed" one could do, besides the act of becoming a Muslim, the Prophet responded, "To participate in Jihad (holy fighting) in Allah's Cause." He explained that "to guard Muslims from infidels in Allah's Cause for one day is better than the world and whatever is on its surface." For "a journey undertaken for jihad in the evening or morning merits a reward better than the world and all that is in it."
Muhammad also warned that Muslims who did not engage in jihad would be punished: "Muhammad was firm about the necessity of jihad not only for himself personally, but for every Muslim. He warned believers that he who does not join the warlike expedition (jihad), or equip, or looks well after a warrior's family when he is away, will be smitten by Allah with a sudden calamity.'"
Those who fought in jihads would enjoy a level of Paradise higher than that enjoyed by others:
It has been narrated on the authority of Abu Sa'id Khudri that the Messenger of Allah (may peace be upon him) said (to him]: Abu Sa'id, whoever cheerfully accepts Allah as his Lord, Islam as his religion and Muhammad as his Apostle is necessarily entitled to enter Paradise. He (Abu Sa'id) wondered at it and said: Messenger of Allah, repeat it for me. He (the Messenger of Allah) did that and said: There is another act which elevates the position of a man in Paradise to a grade one hundred (higher), and the elevation between one grade and the other is equal to the height of the heaven from the earth. He (Abu Sa'id) said: What is that act? He replied: Jihad in the way of Allah! Jihad in the way of Allah!
On another occasion "a man came to Allah's Apostle and said, 'Instruct me as to such a deed as equals Jihad (in reward).' He replied, 'I do not find such a deed.'"
The above is an excerpt from the book, The Politically Incorrect Guide to Islam (and the Crusades) by Islamic scholar, Robert Spencer.