أَخْبَرَنِي مُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا أَبُو النَّضْرِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنِ امْرَأَتِهِ، فَاطِمَةَ عَنْ أَسْمَاءَ بِنْتِ أَبِي بَكْرٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَعَنَ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ ‏.‏

It was narrated from Hisham bin 'Urwah, from his wife Fatimah, from Asma' bint Abi Bakr, that: The Messenger of Allah [SAW] cursed the woman who affixes hair extensions and the woman who has that done. Translation Not Available

Book Ref: Sunan An Nisai Book 48 Hadith 5094
Web Ref:  Sunan An Nisai Vol 6 Book 48 Hadith 5097