Musnad Ahmad 1153:833

Musa ibn Dawud narrated to us, Fulayh ibn Sulayman narrated to us, from Khawat ibn Salih, from his paternal aunt, Umm Amr bint Khawat, that a woman said to Aisha: "My daughter was afflicted with an illness, and her hair fell out, and it is thick, and I cannot comb it, and she is a bride. Should I add to her hair?" Aisha said: "The Messenger of Allah, may Allah bless him and grant him peace, cursed the one who adds hair extensions and the one who asks for them to be added."