Musnad Ahmad 26:873

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Sulayman, who said: I heard Abu Wa'il, from 'Abdullah, from the Prophet (peace and blessings of Allah be upon him) that he said: "If you are three, then two of you must not whisper to each other excluding their companion, for that would sadden him. And a woman must not touch another woman and then describe her to her husband, as if he were looking at her."