Riyad as-Salihin 1598

Translation

Ibn 'Umar (May Allah be pleased with them) said: the Messenger of Allah (PBUH) said, "In the presence of three people, two should not hold secret counsel, to the exclusion of the third." [Al- Bukhari and Muslim]. In Abu Dawud, Abu Salih related: I asked Ibn 'Umar: "What if there are four people." He said, "There is no harm in that." Malik reported in Al-Muwatta that 'Abdullah bin Dinar related: Ibn 'Umar and I were together in Khalid bin 'Uqbah's house which was situated in the market place. A man came to consult Ibn 'Umar. None besides me was present. Ibn 'Umar called another man in and we became four and said to me and the man he had called: Move away a bit because I have heard the Messenger of Allah (PBUH) saying, "The two people should not hold secret counsel together excluding the third."

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Same hadith, other wordings

• Muwaththa' Malik 56-14أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا كَانَ ثَلاَثَةٌ فَلاَ يَتَنَاجَى اثْنَانِ دُونَ وَاحِدٍ
• Sunan Abu Dawud 4852فَقُلْتُ لاِبْنِ عُمَرَ فَأَرْبَعَةٌ قَالَ لاَ يَضُرُّكَ
• Shahih Muslim 2183aإِذَا كَانَ ثَلاَثَةٌ فَلاَ يَتَنَاجَى اثْنَانِ دُونَ وَاحِدٍ
• Shahih al-Bukhari 6288«إِذَا كَانُوا ثَلاَثَةٌ فَلاَ يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ۔»