Beautiful!
Look what Shaykh ul-Islam Ibn Taymiyyah رحمه الله تعالى says:
"Judging with justice is absolutely obligatory—at all times and in all places—upon everyone and for everyone. Judging according to what Allah has revealed to Muhammad ﷺ is a specific form of justice;
𝐃𝐨𝐞𝐬 𝐒͟𝐡𝐚𝐲𝐤͟𝐡 𝐒̣𝐚̄𝐥𝐢𝐡̣ 𝐀̄𝐥 𝐚𝐬𝐡-𝐒͟𝐡𝐚𝐲𝐤͟𝐡 𝐮𝐬𝐞 𝐭𝐡𝐞 𝐭𝐞𝐫𝐦 “𝐈𝐥𝐭𝐢𝐳𝐚̄𝐦” 𝐮𝐧𝐫𝐞𝐬𝐭𝐫𝐢𝐜𝐭𝐞𝐝𝐥𝐲 𝐢𝐧 𝐭𝐡𝐞 𝐈ʿ𝐭𝐢𝐪𝐚̄𝐝𝐢 𝐬𝐞𝐧𝐬𝐞 𝐨𝐫 𝐜𝐚𝐧 𝐡𝐞 𝐮𝐬𝐞 𝐢𝐭 𝐢𝐧 𝐭𝐡𝐞 ʿ𝐀𝐦𝐚𝐥𝐢̄ 𝐬𝐞𝐧𝐬𝐞 𝐭𝐨𝐨
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Q 559 : What is the ruling on one who gives fatwā according to the Sharīʿah , but when judging (qaḍāʾ) — meaning: when he passes judgment — he judges according to man-made law? Is this from the action of fusāq al-ʿulamā, and is his action considered from that by which someone like him commits kufr, or from that which renders someone like him a disbeliever?
S͟hayk͟h Ṣāliḥ Āl ash-S͟hayk͟h responds :
“There is no doubt that the least of his states is that he is fāsiq. He gives fatwā according to the Sharīʿah to the people, but when he judges between them — because that government makes the law (qānūn), the constitution (dustūr), or what judgment is based upon — he judges by the law in certain matters, and gives fatwā according to the Sharīʿah. The least of his states is that he is a fāsiq. He may even be a disbeliever if he believes that this action is permissible; if he believes that his action is permissible and presents it as good to the people, then he is a disbeliever by consensus (ijmāʿ).
And his ruling by the law — meaning his adherence (iltizām) to the law in everything that has come by it, and not departing from it — is considered by many of the people of knowledge to be disbelief (kufr), even if he believes it to be impermissible. So the condition of the one asked about, if he is from the scholars, then there is no doubt that it is a fāsiq at the very least, and he may be a disbeliever thereby”
(1/592) الأجوبة والبحوث
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I say :
The Shaykh makes a clear distinction initially, that who he is referring to is the one who passes on judgement in cases that come to him, as opposed to the one who makes the law or constitution or the reference to which judgements are based upon or referred back to.
He then speaks about how the person who passes fatwa in accordance to the Sharīʿah but passes judgements [upon people] based upon other than the Shari'ah at the very least is a fāsiq, and that he would be rendered a disbeliever if he believed that his action was permissible, justified it, and so on and so fourth. He then attributes the disbelief of such a person as being a consensus amongst the people of knowledge
Right afterwards, he then speaks about the one who adheres (iltizam) to ruling by this man made law in his judgements, in everything that has come by it and he doesn't depart from it, he says this is considered disbelief according to many of the people of knowledge, even if they were to not do istihlal. The Shaykh doesn't bring a consensus in this, which necessitates the fact that the Shaykh uses adherence (iltizam) in the amali sense, and not an iʿtiqādi sense as people wished to say that the Shaykh unrestrictedly only used the term "iltizam" in an iʿtiqādi sense. The reasoning is because if the S͟hayk͟h used iltizām here in the sense he meant iʿtiqād, then this would be considered disbelief by Ijmāʿ, not something a majority held. And he says this in other places.
It's important to note, that the S͟hayk͟h believes the judge who rules by other than the Sharīʿah absolutely in cases of disputes, has become a disbeliever by virtue of his actions even if he didn’t do istiḥlāl, because the act necessitates that he hasn't rejected the Taghut inwardly, and that this action manifests only from a heart which holds the man made laws in high esteem.