Sahih Muslim | Book 26 | Chapter 14

Narrated by Ibn Umar
Ibn Umar reported Allah's Messenger (may peace be upon him) as saying: When there are three (persons), two should not converse secretly between themselves to the exclusion of the (third) one.

Narrated by lbn 'Umar
This hadith has been reported on the authority of lbn 'Umar through two different chains of transmitters.
Narrated by 'Abdullah
'Abdullah reported Allah's Messenger (may peace be upon him) as saying: If you are three, two amongst you should not converse secretly between yourselves to the exclusion of the other (third one), unti some other people join him (and dispel his loneliness), for it may hurt his feelings.

Narrated by 'Abdullah
'Abdullah reported Allah's Messenger (may peace be upon him) as saying: If you are three, two should not converse secretly to the exclusion of your companion for that hurts his feelings.

Narrated by A'mash
This hadith has been reported on the authority of A'mash with the same chain of transmitters.