Quran 58:9 — The Debate (Al-Mujaadalah)

O you who believe, if you have to confer secretly, you shall not confer to commit sin, transgression, and to disobey the messenger. You shall confer to work righteousness and piety. You shall reverence GOD, before whom you will be summoned.

[58:8] Have you noted those who were enjoined from conspiring secretly, then insist on conspiring? They conspire to commit sin, transgression, and disobedience of the messenger. When they come to you, they greet you with a greeting other than that decreed by GOD. They say inside themselves, "GOD will not punish us for our utterances." Their only requital is Gehenna, wherein they burn; what a miserable destiny.

[58:10] Secret conspiracy is the devil's idea, through which he seeks to hurt those who believed. However, he cannot hurt them against GOD's will. In GOD the believers shall trust.