(33) بَاب تَحْرِيمِ فِعْلِ الْوَاصِلَةِ وَالْمُسْتَوْصِلَةِ وَالْوَاشِمَةِ وَالْمُسْتَوْشِمَةِ وَالنَّامِصَةِ وَالْمُتَنَمِّصَةِ وَالْمُتَفَلِّجَاتِ وَالْمُغَيِّرَاتِ خَلْقِ اللَّهِ
Sa'id b. Musayyib reported:
Mu'awiya came to Medina and he addressed us and he took out a bunch of hair and said: What do I see that one of you does but that what the Jews did? (I can well recall) that when this act (adding of artificial hair) reached Allah's Messenger (ﷺ), he named it as cheating.
Reference: Sahih Muslim 2127 c
In-book reference: Book 37, Hadith 188
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5308