A: The one who participates in this war should purify his intention, making it solely to remove injustice and benefit Muslims so that Allah (Exalted be He) rewards him and deems him as a martyr if he is killed. The armies do not fight under the banners of disbelief but every army should have its commander. Saudi armies have their commander Khalid ibn Sultan under the commanderinchief the Custodian of the Two Holy Mosques. Similarly, other armies such as the Egyptian, Syrian, British, and other armies, are controlled by a joint plan that they cannot deviate from. Allah (Exalted be He) says, and do not dispute (with one another) lest you lose courage and your strength departs There must be a kind of organization and cooperation among everyone to avoid failure and defeat by the enemy.
Once a man came and asked the Prophet, "(What do you think) if a man comes to me in order to seize my possession?" He (the Prophet) said, "Do not surrender your possession to him." He (the inquirer) said, "If he fights me?" He (the Prophet) remarked, "Then fight (him)." He (the inquirer) again said, "What do you think if I am killed?" He (the Prophet) observed, "You would be a martyr." He (the inquirer) said, "What if I kill him." He (the Prophet) said, "He would be in the Hell." (Related by Muslim in his Sahih)
This is the case of a person who defends his property. Then, what do you think of a person who defends his religion, Muslim brothers and the sanctities of Islam! The Prophet (peace be upon him) said, "Whoever is killed defending his religion is a martyr; whoever is killed in defense of his own life is a martyr; and whoever is killed in defense of his family is a martyr, he who is killed in defense of his property is a martyr.''
The warriors in this war, if Allah (Exalted be He) purifies their intentions, are simply defending the religion of Islam and the Muslims' lives, property, countries, and honor. They also save the Muslims from the danger of an irreligious enemy whose harm is severer than that of the Jews and Christians. This is great turmoil and Jihad is considered as one of the most important duties in this regard. As for those who fight by the side of the wrongdoer, they are promised Hell for they assist him in his injustice and aggression. It is even feared that those people will receive the same judgment if they approve of his Ba'thist doctrine or consider killing Muslims to be permissible. Undoubtedly, they share the sin of doing injustice and aggression. Whether or not they are outside the fold of Islam, is an issue with many details; however, they are liable to punishment even if they are Muslims because of fighting on the side of aggressors against their wronged Muslim brothers.
On the other hand, the Muslim who stands against the oppressors and fights them is expected to have great reward; if they are killed, they will be martyrs; if they are taken prisoners or hurt, they will be rewarded. They will be credited in any case, if Allah (Exalted be He) purifies their intention.