Sunan Ibn Majah 3775
سنن ابن ماجه#3775SahihIt was narrated from Abdullah that the Messenger of Allah(ﷺ) said:"When you are three, two should not converse (privately) to the exclusion of their companion, because that makes him sad
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 33:119