From Sahih Bukhari (Hadith 5935):
Narrated Asma:(the daughter of Abu' Bakr) A woman came to Allah's Messenger (ﷺ) and said, "I married my daughter to someone, but she became sick and all her hair fell out, and (because of that) her husband does not like her. May I let her use false hair?" On that the Prophet (ﷺ) cursed such a lady as artificially lengthening (her or someone else's) hair or got her hair lengthened artificially
Reference: Bukhari 5935