Sahih Bukhari Volume 2, Book 26, Hadith Number 822.

Narated By Ibn ‘ Abbas  : Dhul-Majaz and ‘Ukaz were the markets of the people during the pre-lslamic period of ignorance. When the people embraced Islam, they disliked to do bargaining there till the following Holy Verses were revealed: There is no harm for you If you seek of the bounty Of your Lord (during Hajj by trading, etc.) (2.198)