Sahih Muslim 13645
In-book no 6368حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، وَابْنُ أَبِي عُمَرَ، وَعَمْرٌو النَّاقِدُ، جَمِيعًا عَنِ ابْنِ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ وَزَادَ ابْنُ عُيَيْنَةَ " وَلاَ تَقَاطَعُوا " .
This hadith has been narrated on the authority of Zuhri with the same chain of transmitters with the addition of Ibn Uyaina (and the words are): " Do not cut off (mutual relations)."