Sunan an-Nasa'i, Book 48, Hadith 211 (In-Book) ⓘ

It was narrated from Asma' that: A woman came to the Messenger of Allah [SAW] and said: "O Messenger of Allah [SAW], a daughter of mine is going to get married. She got sick and her hair fell out. Is there any sin on me if I give her hair extensions?" He said: "Allah has cursed the woman who affixes hair extensions and the one who has that done."

أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا يَحْيَى، عَنْ هِشَامٍ، قَالَ حَدَّثَتْنِي فَاطِمَةُ، عَنْ أَسْمَاءَ، أَنَّ امْرَأَةً، جَاءَتْ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّ بِنْتًا لِي عَرُوسٌ وَإِنَّهَا اشْتَكَتْ فَتَمَزَّقَ شَعْرُهَا فَهَلْ عَلَىَّ جُنَاحٌ إِنْ وَصَلْتُ لَهَا فِيهِ فَقَالَ ‏ "‏ لَعَنَ اللَّهُ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ ‏" ‏ ‏.‏