Tahqeeq（考证）的 'Illah（效因/依据）：
The Tahqeeq (ascertaining of) the ‘Illah:
这涉及考察沙里尔（Shar'iyah）文本，以获取作为律令（Hukm）起因或动机的那一事由的知识。这要求我们熟悉确立因果推理的措辞（Alfaazh）与表达方式（Asaleeb），以及它们在文本中的运用。例如，要考察先知（ﷺ）的以下这句话是否确立了因果推理（Al-'Illiyah），就需要如此考察：
This involves examining the Shar’iyah texts to acquire knowledge of the matter that is the cause or motive for the Hukm. This requires us to be knowledgeable of the Alfaazh (worded expressions) and Asaleeb (styles) that establish reasoning, and their application upon the texts. So for example the following statement of the Messenger (saw) would be examined to see if it establishes reasoning (Al-‘Illiyah) or not:
关于自由放牧的羊，需要缴纳天课（Zakaah）。
In respect to the free grazing sheep there is Zakaah (due)
（由布哈里和艾布·达乌德以不同的措辞记载）
(Al-Bukhaari and Abu Daawood with a different wording)
因此，每一项哈昆·沙尔埃（Hukm Shar'iy，即沙里亚律例）都建立在两个前提之上。
And so in this way every Hukm Shar’iy is based upon two premises: