Narrated Asma'

(the daughter of Abu Bakr) Allah's Apostle has cursed such a lady as artificially lengthening (her or someone else's) hair or gets her hair lengthened.

حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنِ امْرَأَتِهِ، فَاطِمَةَ عَنْ أَسْمَاءَ بِنْتِ أَبِي بَكْرٍ، قَالَتْ لَعَنَ النَّبِيُّ ﷺ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ.