Sahih Muslim 2184
Sahih Muslim · Book 39: The Book of Greetings · The Prohibition Of Two People Conversing Privately To The Exclusion Of A Third Without His Consent
وَحَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ ، أَخْبَرَنَا عِيسَى بْنُ يُونُسَ ، ح وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ ، حَدَّثَنَا سُفْيَانُ ، كِلاَهُمَا عَنِ الأَعْمَشِ ، بِهَذَا الإِسْنَادِ .
This hadith has been reported on the authority of A'mash with the same chain of transmitters.