Allah the Exalted teaches His believing servants to avoid the ways of the disbelievers and hypocrites,

[يأَيُّهَا الَّذِينَ ءَامَنُواْ إِذَا تَنَاجَيْتُمْ فَلاَ تَتَنَـجَوْاْ بِالإِثْمِ وَالْعُدْوَانِ وَمَعْصِيَةِ الرَّسُولِ]

(O you who believe! When you hold secret counsel, do it not for sin and wrongdoing, and disobedience to the Messenger,) meaning, do not hold evil secret counsels like the ignorant disbelieving People of the Scriptures and their allies among the hypocrites, who imitate their ways,

[وَتَنَـجَوْاْ بِالْبِرِّ وَالتَّقْوَى وَاتَّقُواْ اللَّهَ الَّذِى إِلَيْهِ تُحْشَرُونَ]

(but do it for Al-Birr and Taqwa; and have Taqwa of Allah unto Whom you shall be gathered.) and He will then inform you of all your deeds and statements; He has counted and recorded them and will justly hold you accountable for them. Allah the Exalted said,

[إِنَّمَا النَّجْوَى مِنَ الشَّيْطَـنِ لِيَحْزُنَ الَّذِينَ ءَامَنُواْ وَلَيْسَ بِضَآرِّهِمْ شَيْئاً إِلاَّ بِإِذْنِ اللَّهِ وَعَلَى اللَّهِ فَلْيَتَوَكَّلِ الْمُؤْمِنُونَ ]

(An-Najwa are only from the Shaytan, in order that he may cause grief to the believers. But he cannot harm them in the least, except as Allah permits. And in Allah let the believers put their trust.) Allah states that secret talks, where the believers feel anxious, are

[مِنَ الشَّيْطَـنِ لِيَحْزُنَ الَّذِينَ ءَامَنُواْ]

(only from Shaytan, in order that he may cause grief to the believers.) meaning, that those who hold such counsels do so because of the lures of the devil,

[لِيَحْزُنَ الَّذِينَ ءَامَنُواْ]

(in order that he may cause grief to the believers.) The devil seeks to bother the believers, even though his plots will not harm the believers, except if Allah wills it. Those who are the subject of evil Najwa, should seek refuge in Allah and put his trust in Him, for none of it will harm them, Allah willing. The Sunnah also forbids the Najwa so that no Muslim is bothered by it. Imam Ahmad recorded that `Abdullah bin Mas`ud said that the Messenger of Allah said,

«إِذَا كُنْتُمْ ثَلَاثَةً فَلَا يَتَنَاجَى اثْنَانِ دُونَ صَاحِبِهِمَا، فَإِنَّ ذلِكَ يُحْزِنُه»

(If you were three, then two of you should not hold a secret counsel in the presence of the third person, because that would cause him to be worried.) This Hadith is collected in the Two Sahihs using a chain of narration that contained Al-A`mash. `Abdur-Razzaq narrated that `Abdullah bin `Umar said that Allah's Messenger said,

«إِذَا كُنْتُمْ ثَلَاثَةً فَلَا يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ إِلَّا بِإِذْنِهِ، فَإِنَّ ذلِكَ يُحْزِنُه»

(If you were three, then two of you should not hold a secret counsel in the presence of the third person, except with his permission, because that would cause him to be worried.) Muslim collected this Hadith.

[يأَيُّهَا الَّذِينَ ءَامَنُواْ إِذَا قِيلَ لَكُمْ تَفَسَّحُواْ فِى الْمَجَـلِسِ فَافْسَحُواْ يَفْسَحِ اللَّهُ لَكُمْ وَإِذَا قِيلَ انشُزُواْ فَانشُزُواْ يَرْفَعِ اللَّهُ الَّذِينَ ءَامَنُواْ مِنكُمْ وَالَّذِينَ أُوتُواْ الْعِلْمَ دَرَجَـتٍ وَاللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ ]

(11. O you who believe! When you are told to make room in the assemblies, make room. Allah will give you room. And when you are told to rise up, then rise up. Allah will exalt in degress those of you who believe, and those who have been granted knowledge. And Allah is Well-Acquainted with what you do.)