Sahih Muslim Book 24, Hadith Number 5297.

Chapter : It Is forbidden to add false hair to one’s head or to pluck the eyebrow or to separate the teeth.

Asma’, daughter of Abu Bakr, reported that a woman came to Allah’s Apostle (may peace be upon him) and said: I have married my daughter (whose) hair of head have fallen. Her spouse likes them (the long hair). Allah’s Messenger(may add false hair to her head? He forbade her to do this.