"在乌侯德之日,库兹曼奋战得如此英勇,以至于他一人就杀死了七到八名多神教徒……"这与关于萨夫旺的记载相辅相成。这些证据表明,异教徒可以随伊斯兰军队作战,并因其服务而获得财产或金钱。"雇佣"(Ijara)的定义是对某种利益的契约,因此,只要雇主能从受雇者那里获得某种利益,雇佣便是允许的。所以,雇佣人员参军作战是允许的,因为这属于一种利益。因此,关于雇佣任何利益的一般性证据,足以允许雇佣异教徒参军或作战。这是针对非穆斯林而言的。
至于穆斯林,尽管圣战是一种崇拜行为,但仍然允许雇佣穆斯林参军作战,这依据的是雇佣的一般性证据:如果某项崇拜的利益惠及实施者以外的人,则允许为其雇佣。这源于先知ﷺ的话:"最应当收取报酬的事情是教授《古兰经》。"[布哈里根据伊本·阿拔斯的传述所载]教授安拉的经典是一种崇拜,既然允许雇佣穆斯林教授《古兰经》、领拜或宣礼,而这些都是崇拜行为,那么雇佣穆斯林参加圣战并入伍,同样是允许的。
此外,还有证据表明可以雇佣穆斯林从事圣战,即便圣战对他们而言是一项义务。艾布·达乌德传述,阿卜杜拉·本·欧麦尔说,先知ﷺ说:"出征者有他自己的回赏,出资者有他自己的回赏,以及出征者的回赏。"出征者(Al-Ghazi)是为自己而战的人。出资者(Al-Ja'il)是指有他人代替自己作战,并向其支付报酬的人。在《大辞典》(Al-Muheet)中说明,"Al-Ja'ala"是给予做某件事之人的报酬,而如果有人为你代替出征,并付给报酬,那么这笔报酬就归属于代战的圣战者(Ghazi)。 “Ajr”既是工资（Ujrah），也是回报（Thawab）。至于人们普遍认为，“Ajr”总是指真主（SWT）因仆人的善行而赐予他的回报，而“Ijara”则是一人对另一人为某项工作所付的报酬，其中包括“Ajeer”即雇工或劳力，这种区分实际上并无依据。相反，语言所表明的是，Ajr即是对某一行为的报酬，就如同Ijara一样。辞书《Al-Muheet》中记载，Al-’ajr即是对行为的报酬，如同Ijara。这段圣训的含义是：Al-Ghazi（出征者）有他自己的回报，Ja’il（出资者）有他自己的回报，以及他所雇去替他出征者的回报。这里的“Ghazi”（出征者）一词表明，Ajr在此指的是回报（Thawab），而“Al-Ja’il”一词也表明Ajr同样指回报（Thawab），因为这两个词（Ghazi和Ja’il）都是决定其预期含义的语境线索（Qareena）。Al-Bayhaqi引述Jubayr bin Nufayr的传述，他说：“安拉的使者ﷺ说道，”
‘At the day of Uhud, Kuzman fought so strongly that He alone killed seven to eight of the mushrikeen…’” This is in addition to what was reported about Safwan. These evidences indicate that a Kafir can be with the Islamic army and be given property or money for his service. The definition of ‘Ijara’ or hiring as being a contract over a benefit means that hiring is allowed for every benefit that the hiring person can receive from the hired person. So the hiring of a person for the army and fighting is allowed because it is a benefit. Thus, the general evidence of hiring over any benefit or benefits is valid for allowing hiring of a Kafir for the Army, or for fighting. This is with regards to non-Muslims. As for the Muslims, even though Jihad is an act of worship, it is allowed to hire Muslims for the army and to fight because of the general evidence of hiring where hiring is allowed for carrying out the Ibadah if its benefit extends to more than the one who carries it out. This is due to the saying of the Prophet (pbuh); “The most worthy thing to take a wage on is teaching the Book of Allah.” [Narrated by Bukhari on the authority of Ibn Abbaas] Teaching the book of Allah is a worship and since it is allowed to hire a Muslim to teach the Qur’an, lead the prayer, or give Azaan, which are all acts of worship, it is also allowed to hire a Muslim to do Jihad and be in the army. Moreover, there is evidence for the hiring of Muslims for Jihad even though it is a duty upon them. Abu Dawood narrated that ‘Abdullah bin ‘Umar said that the Prophet (pbuh) said; “Al-Ghazi has his own Ajr and Al-Ja’il has his own Ajr and the Ajr of the Al-Ghazi.” Al-Ghazi is a person who fights for him. Al-Ja’il is the one who has someone else to fight on his behalf in return for a wage He pays to him. It is indicated in the dictionary of Al-Muheet, that Al-Ja’ala is the amount given to someone doing an action and what is assigned to a Mujahid (Ghazi) if He made Jihad on your behalf with a wage. Ajr is both the wage (Ujrah) and reward (Thawab). As for what is well known among people that ‘Ajr always means the reward which comes from Allah (swt) to His servant for doing a good deed and that ‘Ijara’ is the reward for an action from one person to another which includes ‘Ajeer’ or labour. In fact, there is no support for this differentiation. Rather what the language indicated is that the Ajr is the reward for an action. It came in the dictionary Al-Muheet that Al-’ajr is the reward on the action, like the Ijara. The meaning of the Hadith is that Al-Ghazi (fighter) has his own reward while the Ja’il has his own reward and the reward of the one whom He hired to fight on his behalf. Here the word Ghazi, (the fighter) indicates that what is meant by Ajr is reward (Thawab), and the word Al-Ja’il indicates that Ajr means reward (Thawab) as well, because these two words (Ghazi and Ja’il) are both the indication (Qareena) that decides the intended meaning. Al-Bayhaqi narrated on the authority of Jubayr bin Nufayr who said; “The Messenger (pbuh) said,