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wa-qad nazzala ʿalaykum fī l-kitābi ʾan ʾidhā samiʿtum ʾāyāti llāhi yukfaru bihā wa-yustahzaʾu bihā fa-lā taqʿudū maʿahum ḥattā yakhūḍū fī ḥadīthin ghayrihī ʾinnakum ʾidhan mithluhum ʾinna llāha jāmiʿu l-munāfiqīna wa-l-kāfirīna fī jahannama jamīʿan-i
Certainly He has sent down to you in the Book that when you hear Allah’s signs being disbelieved and derided, do not sit with them until they engage in some other discourse, or else you [too] will be like them. Indeed Allah will gather the hypocrites and the faithless in hell all together
— Ali Quli Qarai
Surah An-Nisa', Verse 140
140. "And He has already revealed to you in the Book that when you hear the revelations of Allah being disbelieved and made mock of, do not sit with them until they engage in some other discourse, otherwise you would be like them. Verily Allah will gather the hypocrites and the disbelievers all together in Hell."
Surah Al-'An'am, No.6, verse 68 contains a similar meaning to that of this holy verse. It addresses the Messenger of Allah (S) and says:
In that verse, the addressee is the Prophet (S), while in the above-mentioned verse, the Qur'an addresses people in general.
Explanations
1. A person should not usually be inattentive when confronting the false discourses of others, (since, being silent or inattentive where a sin is being committed, is sinful.)
2. "You may either alter the evil environment, or come out of it."
3. It is not enough to abandon committing sin only; but we should cause the performance of sin to be stopped totally. Mere being straight is not enough; the perversion of others should be hindered of, too.
4. It is not allowed to be silent in front of sin under the pretext of freedom of speech, negligence, good morals, easy circumstances, courtesy, civility; shame, and so on.
5. The person who is content with the sin of others has a share of that sin.
6. To be silent in front of the idle talks of the infidels is a kind of hypocrisy.
7. Companionships of this world result the companionship of the next world.