Narrated Abdullah ibn Abbas:Ibn Abbas recited this verse: 'It is no sin for you that you seek the bounty of your Lord', and said: The people would not trade in Mina (during the hajj), so they were commanded to trade when they proceeded from Arafat.
حَدَّثَنَا يُوسُفُ بْنُ مُوسَى، حَدَّثَنَا جَرِيرٌ، عَنْ يَزِيدَ بْنِ أَبِي زِيَادٍ، عَنْ مُجَاهِدٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، قَالَ قَرَأَ هَذِهِ الآيَةَ { لَيْسَ عَلَيْكُمْ جُنَاحٌ أَنْ تَبْتَغُوا فَضْلاً مِنْ رَبِّكُمْ } قَالَ كَانُوا لاَ يَتَّجِرُونَ بِمِنًى فَأُمِرُوا بِالتِّجَارَةِ إِذَا أَفَاضُوا مِنْ عَرَفَاتٍ .
AbuDaud
The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj) • Hadith 1731