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yā-ʾayyuhā lladhīna ʾāmanū ʾidhā tanājaytum fa-lā tatanājaw bi-l-ʾithmi wa-l-ʿudwāni wa-maʿṣiyati r-rasūli wa-tanājaw bi-l-birri wa-t-taqwā wa-ttaqū llāha lladhī ʾilayhi tuḥsharūna
O you who have faith! When you converse secretly, do not hold private conversations [imbued] with sin and aggression and disobedience to the Apostle, but converse in [a spirit of] piety and Godfearing, and be wary of Allah toward whom you will be gathered.
— Ali Quli Qarai
Surah Mujadila - Verse 9
9. O you who believe! When you hold confidential talk, do it not from sin and wrong-doing and disobedience toward the Messenger, but do it for righteousness and fear of God and fear Allah unto Whom you shall be gathered.
Holding secret counsels and confidential talks may lead to disclosure of secrets and thus it is obligatory when such act entails benefits to the Islamic faith and Muslims. It is unlawful and forbidden when it leads to fear and anxiety for others. It is supererogatory when it assists others and enjoins them to fear God Almighty. The blessed Verse is saying that believers must heed that when they hold confidential talks, they should not thereby commit sins and disobey God Almighty and His Messenger (S), but their confidential talks should be pure and divine. Believers are supposed to hold secret counsels regarding good deeds and fear of God Almighty. It is incumbent upon them to refrain from disobedience to God Almighty to Whom they shall all return.
The blessed Verse is saying that holding confidential talks by believers will create neither suspicion nor concern since such talks aim at enjoining righteous good deeds. But holding secret counsels by Jews and hypocrites is unlawful since they aim at hurting pure hearted believers let alone when the contents of such talks be satanic.