مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4148
Musnad of Abdullah bin Mas'ood
It was narrated from Abdullah, from the Prophet (ﷺ), that He said: "If you are three, two should not converse (privately) to the exclusion of their companion, because that makes him sad. And no woman should took at or touch another woman so she can describe her to her husband."
Musnad Ahmad 4175Its isnad is saheeh, al-Bukhari (6290) and Muslim (2184)]