This hadith has been reported on the authority of lbn 'Umar through two different chains of transmitters.
Sahih Muslim Book 39, Hadith 49
← Previous Hadith When there are three (persons), two should not converse secretly between themselves to the exclusion of the (third) one.

Sahih Muslim Book 39, Hadith 48 Next Hadith → 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.

Sahih Muslim Book 39, Hadith 50