Sahih Bukhari Volume 4, Book 56, Hadith Number 674.

Narated By Humaid bin ‘Abdur-Rahman : That he heard Muawiya bin Abi Sufyan (talking) on the pulpit in the year when he performed the Hajj. He took a tuft of hair that was in the hand of an orderly and said, “O people of Medina! Where are your learned men? I heard the Prophet forbidding such a thing as this (i.e. false hair) and he used to say, ‘The Israelis were destroyed when their ladies practiced this habit (of using false hair to lengthen their locks).”