所以，当你们遇到不信道的人时，就砍他们的颈项，直到你们杀戮众多，然后把他们牢牢捆绑起来（即把他们俘获）。此后，或施恩释放，或索取赎金，直到战争放下它的重负（穆罕默德章第4节）。
So, when you meet those who disbelieve strike at their necks till when you have killed and wounded many of them, then bind a bond firmly (i.e. take them as captives). Thereafter (is the time) either for generosity (i.e. free them without ransom), or ransom until the war lays down its burden (Muhammad 4).
Here is the translation of the heading: **الواجب باعتبار تعيين المطلوب وعدم تعيينه 的分类** Following the requested format, the heading reads: **关于"واجب"按照所要求事项是否确定而划分的类别**
Aqsaam (categories Of) Al-waajib In Regards To The Consideration Of The Specification Of What Is Required And Its Non-specification
1 – 特定的义务（Al-Waajib Al-Mu’ayyan）
1 – Al-Waajib Al-Mu’ayyan (specified):
这是立法者（Ash-Shaari'）本身所要求的，并且没有给予mukallaf在不同事项（或行为）之间进行选择的余地。礼拜就是这类义务的一个例子。因此，除非mukallaf亲自完成了礼拜本身，礼拜的义务不会因此而免除，它也不能以诵读《古兰经》和斋戒来替代。
This is what the Shaari’ has requested in itself without providing the choice to the Mukallaf to choose between different matters (or actions). The Salaah is an example of such an obligation. As such the (obligation of the) Salaah does not fall from the Mukallaf unless he has performed it in itself, so it cannot be substituted by the recitation of the Qur’aan and fasting.
2 ——不确定的义务（不特定义务）或选择性义务（可选义务）：这是立法者（Ash-Shaari'）所要求履行的一项义务，但并非指定某一具体事项，而是在已明确告知的若干事项之中，由应尽义务者（Mukallaf）从中选择一项来执行并完成该义务。这种义务可以像安拉（Ta'aalaa）的以下经文所示，有两种可供选择的情况：
2 – Al-Waajib Ghair ul-Mu’ayyan (non-specified) or Al-Waajib Al-Mukhayyar (of choice): This is what the Shaari’ (Legislator) has requested to be undertaken; not in itself (specifically) but within matters which have been made known. It is up to the Mukallaf to choose one from them in order to perform and fulfil such a Waajib. This Waajib could be one of two like in the Qawl of Allah Ta’Aalaa:
这表明，由哈里发决定是释放战俘，还是以赎金交换战俘。
This informs us that it is up to the Khalifah either to let the captives of war free or to exchange them by ransom.
非特定的Waajib也可以是三件事中的一件，其例子是誓言的赎罪（Kaffaarah）。违背誓言的人有义务做以下三件事之一：供养十名贫困者，为他们提供衣物，或释放一名奴隶。这是指具备能力的情况；如果没有能力，则义务是特定的（Mu'ayyan），即斋戒三天。
The non-specified Waajib could also be one from three matters and its example is the Kaffaarah (expiation) of the Yameen (oath). It is obligatory upon the one who breaks the oath to do one of three things: The feeding of ten poor, or providing clothing to them or to free a slave. This is in the case when the capability exists but if the capability is not present then the obligation is Mu’ayyan (specified) and that is the fasting of three days.