Sunan an-Nasa'i 4456
It was narrated that 'Amr bin Taghilb said:
"The Messenger of Allah said: 'One of the portents of the Hour will be that wealth becomes widespread and abundant, and trade will become widespread, but knowledge will disappear. A man will try to sell something and will say: "No, not until I consult the merchant of banu so and so: and People will look throughout a vast area for a scribe and will not find one." (Sahih )
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ أَنْبَأَنَا وَهْبُ بْنُ جَرِيرٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ يُونُسَ، عَنِ الْحَسَنِ، عَنْ عَمْرِو بْنِ تَغْلِبَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ إِنَّ مِنْ أَشْرَاطِ السَّاعَةِ أَنْ يَفْشُوَ الْمَالُ وَيَكْثُرَ وَتَفْشُوَ التِّجَارَةُ وَيَظْهَرَ الْعِلْمُ وَيَبِيعَ الرَّجُلُ الْبَيْعَ فَيَقُولَ لاَ حَتَّى أَسْتَأْمِرَ تَاجِرَ بَنِي فُلاَنٍ وَيُلْتَمَسَ فِي الْحَىِّ الْعَظِيمِ الْكَاتِبُ فَلاَ يُوجَدُ ‏"‏ ‏.‏