حَدَّثَنَا يَحْيَى بْنُ حَسَّانَ ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُسْلِمٍ ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ ، قَالَ : كَتَبَ عُمَرُ بْنُ عَبْدِ الْعَزِيزِ إِلَى أَهْلِ الْمَدِينَةِ :" أَنْ انْظُرُوا حَدِيثَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَاكْتُبُوهُ، فَإِنِّي قَدْ خِفْتُ دُرُوسَ الْعِلْمِ وَذَهَابَ أَهْلِهِ "

Yahya bin Hassan told us, Abdul Aziz bin Muslim told us, on the authority of Abdullah bin Dinar, he said: Omar bin Abdul Aziz wrote to The people of Medina: “Look at the hadith of the Messenger of God, may God bless him and grant him peace, and write it down, for I fear the lessons of knowledge and the departure of its people.”