Definition of the term.—Nifka, in the language of the law, signifies all those things which are necessary to the support of life, such as food, cloth… - Burhan al-Din al-Murghinani

If the Imám should not bestow in gratuity the Sillib (or personal property) of one who is slain, upon the slayer, it becomes a part of the general plunder, in which the slayer and other have all an equal share. Shafei maintains that the personal effects of the person slain belong to the slayer, provided the latter be one of those who are entitled to share in the plunder, and that he killed the slain in open fight, because the prophet has said, "Whoever slays an INFIDEL is "entitled to his personal property."
OBJECTION.—It is possible that the prophet may have mentioned this merely in a gratious sense, and not as the award of the LAW.
REPLY.—It is evident, from the situation of the prophet, that he spoke this as an award of the LAW; since he was sent to enforce the awards of the LAW. A person, moreover, who kills another prepared to oppose him in open fight exposes himself in a superior degree, and hence the personal property of the slain goes to him, for the purpose of making a distinction between him and others.

"If a Muslim attack infidels without previously calling them to the faith, he is an offender, because this is forbidden; but yet if he do attack them before thus inviting them and slay them, and take their property, neither fine, expiation, nor atonement are due, because that which protects (namely, Islam) does not exist in them, nor are they under protection by place (namely the Daru ‘l-Islam, or Muslim territory), and the mere prohibition of the act is not sufficient to sanction the exaction either of fine or of atonement for property; in the same manner as the slaying of the women or infant children of infidels is forbidden, but if, notwithstanding, a person were to slay such, he is not liable to a fine. It is laudable to call to the faith a people to whom a call has already come, in order that they may have the more full and ample warning; but yet this is not incumbent, as it appears in the Traditions that the Prophet plundered and despoiled the tribe of al-Mustaliq by surprise, and he also agreed with Asamah to make a predatory attack upon Qubna at an early hour, and to set it on fire, and such attacks are not preceded by a call. (Qubna is a place in Syria: some assert it is the name of a tribe).

The following is the teaching of the Hanafi school of Sunnis on the subject of Jihad, as given in the Hidayah...:--
"The sacred injunction concerning war is sufficiently observed when it is carried on by any one party or tribe of Muslims, and it is then no longer of any force with respect to the rest. It is established as a divine ordinance, by the word of God, who said in the Qur’an, ‘Slay the infidels,’ and also by a saying of the Prophet, ‘War is permanently established until the Day of Judgment’ (meaning the ordinance respecting war). The observance, however, in the degree above mentioned, suffices, because war is not a positive injunction, as it is in its nature murderous and destructive, and is enjoined only for the purpose of advancing the true faith or repelling evil from the servants of God; and when this end is answered by any single tribe or party of Muslims making war, the obligation is no longer binding upon the rest, in the same manner as in the prayers for the dead-(if, however, no one Muslim were to make war, the whole of the Muslim, would incur the criminality of neglecting it) – and also because if the injunction were positive, the whole of the Muslims must consequently engage in war, in which case the materials for war (such as horses, armour, and so forth) could not be procured. Thus it appears that the observance of war as aforesaid suffices, except where there is a general summons (that is, where the infidels invade a Muslim territory, and the Imam for the time being issues a general proclamation requiring all persons to go forth to fight), for in this case war becomes a positive injunction with respect to the whole of the inhabitants, whether men or women, and whether the Imam be a just or an unjust person; and if the people of that territory be unable to repulse the infidels, then war becomes a positive injunction with respect to all in that neighbourhood; and if these also do not suffice it, then comes a positive injunction with respect to the next neighbours; and in same manner with respect to all the Muslims from east to west. The destruction of the sword is incurred by infidels, although they be not the first aggressors, as appears from various passages in the traditions which are generally received to this effect.