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Ibn Abbas radiya Allahu anhu said:
"Do not speak of a matter if the matter isn't yours, until you find therein a place for your words.
Do not argue with a foolish or with a forbearing, for the forbearing will defeat you and the foolish will despise you.
Never mention your Muslim brother is his absence with anything other than what you would like him to mention you with in your absence.
When you do something, do it in the manner of someone who knows for a surety will be rewarded for his righteousness and be taken for his faults."
1. The Golden Rules of Disagreement
a) The infallible sources of Islamic Law are three Qur'an, Sunnah of the Prophet and the Ijmaa' of the Sahaba - Ijmaa is the unanimous agreement of the Sahaba or scholars of Islam in general on a point of Islamic Law through Shura.
b] Khilaaf (disagreement) is unacceptable in clear matters of Sharee'ah
c) Khilaaf is acceptable in matters of ijtihad which is the reasoning process by which Islamic laws are deduced after through research. . Codes of Ijtihad are Qiyaas (analogy), Ra'i (opinion), Istihsaan - perference of one proof over another proof (intuition), Istis'hab (process of deducing fiqh law by linking a later set of circumstances with earlier ones)and Leaving ijtihad allowable. Ruling on Ijtihad: If the Mujtahid makes ijtihad then he receives a reward for the ijtihad and another reward if the Ijtihad is correct but all rulings through ijtihad are valid if they are correct or not in case of unawareness of the truth. If the ruling through ijtihad is not correct the Mujtahid receive one reward but there is no sin.
d) Don't forget that the Mercy comes from Allah subhanahu wa ta'ala
e) Follow the Truth: Don't think that you are the only one in truth. "I Don't Know" is Half of Knowledge.
2. The Golden Ethics of Disagreement
a) Identify the terminology. Ask you opponent "What do you mean by this and that word or sentence."
b] Verify authenticity of every single opinion
c) Clarify reason behind particular disagreement
d) Do not judge intentions
e) Assume the truth might come from the opponents tongue
f) Equal opportunity to answer for opponents
g) Do not interrupt when your opponent speaks
h) Do not be bitter argumented
i) Submit to the truth of the opponent
j) Be united on principle; accept disagreement
k) Maintaining brotherhood/sisterhood
3. The Golden Tips for After Disagreement
a) Always find excuse for opponent
b] No accusations, name calling, trolling, flaming, or mobbing
c) Do not criticize opinion of Ulama, 4 Imams, Fuqahaa' etc
d) Never enforce an opinion on someone else
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Use this article as a guideline when debating or when you are discussing a matter with a group of people brothers and sisters in faith....it will definitely be of benefit to us all

Salam