Two persons should not talk privately ignoring the third, for that will grieve him.
Sunan Abi Dawud Book 43, Hadith 79
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Sunan Abi Dawud Book 43, Hadith 78 Next Hadith → Abu Salih said: I asked Ibn `Umar: If they are four? He replied: Then it does not harm you.

Sunan Abi Dawud Book 43, Hadith 80