Sahih Bukhari 1770

حَدَّثَنَا عُثْمَانُ بْنُ الْهَيْثَمِ ، أَخْبَرَنَا ابْنُ جُرَيْجٍ ، قَالَ عَمْرُو بْنُ دِينَارٍ , قَالَ ابْنُ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا : كَانَ ذُو الْمَجَازِ وَعُكَاظٌ مَتْجَرَ النَّاسِ فِي الْجَاهِلِيَّةِ ، فَلَمَّا جَاءَ الْإِسْلَامُ كَأَنَّهُمْ كَرِهُوا ذَلِكَ , حَتَّى نَزَلَتْ : لَيْسَ عَلَيْكُمْ جُنَاحٌ أَنْ تَبْتَغُوا فَضْلا مِنْ رَبِّكُمْ سورة البقرة آية 198 فِي مَوَاسِمِ الْحَجِّ .

Narrated Ibn ' `Abbas: Dhul-Majaz and `Ukaz were the markets of the people during the Pre-Islamic 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)