أَخْبَرَنَا عَفَّانُ، حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، أَنْبَأَنَا أَبُو حَمْزَةَ الثُّمَالِيُّ، عَنْ الْحَسَنِ، قَالَ: "غَائِلَةُ الْعِلْمِ النِّسْيَانُ".
It is narrated from Abu Hamzah al-Tammar that Hasan al-Basri, may Allah have mercy on him, said: The evil of knowledge is forgetfulness.