An Ansari girl was married and she became sick and all her hair fell out intending to provide her with false hair. They asked the Prophet ﷺ who said, "Allah has cursed the lady who artificially lengthens (her or someone else's) hair and also the one who gets her hair lengthened."  

أَنْ يَصِلُوهَا فَسَأَلُوا النَّبِيَّ ﷺ فَقَالَ لَعَنَ اللَّهُ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ  

A'isha reported that a girl of the Ansar who had fallen ill and had lost the hair was married. They (her relatives) thought of adding false hair (to her head). so they asked Messenger of Allah ﷺ about it, whereupon he cursed the woman who adds false hair and the woman who asks for it.  

أَنْ يَصِلُوهُ فَسَأَلُوا رَسُولَ اللَّهِ ﷺ عَنْ ذَلِكَ فَلَعَنَ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ  

The Messenger of Allah [SAW] cursed the woman who affixes hair extensions and the woman who has that done.  

أَنَّ رَسُولَ اللَّهِ ﷺ لَعَنَ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ  

"عَنْ أَسْمَاءَ بِنْت أَبِي بَكْرٍ: أَنَّ النَّبِيَّ ﷺ سُئِلَ عَنِ الوِصَالِ فِي الشَّعْرِ، فَلَعَنَ الوَاصِلَةَ وَالمُسْتَوْصِلَةَ".