Musnad Ahmad 937
An old man of Banu Tameem said:
`Ali (رضي الله عنه) addressed us - or he said: ‘Ali said: There will come a difficult time when the rich man will hold fast to that which is in his hand although he was not enjoined to do that. Allah says: `And do not forget liberality between yourselves` [Al-Baqarah 2:237]. The evil [people] will be elevated and good people will be humiliated. And those who are under compulsion (of force or necessity) will be bought from. The Prophet (ﷺ) forbade forced sales, transactions based on ambiguity and selling crops before they have ripened.
حَدَّثَنَا هُشَيْمٌ، أَنْبَأَنَا أَبُو عَامِرٍ الْمُزَنِيُّ، حَدَّثَنَا شَيْخٌ، مِنْ بَنِي تَمِيمٍ قَالَ خَطَبَنَا عَلِيٌّ رَضِيَ اللَّهُ عَنْهُ أَوْ قَالَ قَالَ عَلِيٌّ يَأْتِي عَلَى النَّاسِ زَمَانٌ عَضُوضٌ يَعَضُّ الْمُوسِرُ عَلَى مَا فِي يَدَيْهِ قَالَ وَلَمْ يُؤْمَرْ بِذَلِكَ قَالَ اللَّهُ عَزَّ وَجَلَّ ‏{‏وَلَا تَنْسَوْا الْفَضْلَ بَيْنَكُمْ‏}‏ وَيَنْهَدُ الْأَشْرَارُ وَيُسْتَذَلُّ الْأَخْيَارُ وَيُبَايِعُ الْمُضْطَرُّونَ قَالَ وَقَدْ نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ بَيْعِ الْمُضْطَرِّينَ وَعَنْ بَيْعِ الْغَرَرِ وَعَنْ بَيْعِ الثَّمَرَةِ قَبْلَ أَنْ تُدْرِكَ‏.‏