أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ عَبْدِ الْمَجِيدِ ، حَدَّثَنَا سَوَادَةُ بْنُ حَيَّانَ ، قَالَ : سَمِعْتُ مُعَاوِيَةَ بْنَ قُرَّةَ أَبَا إِيَاسٍ ، يَقُولُ : كَانَ يُقَالُ :" مَنْ لَمْ يَكْتُبْ عِلْمَهُ، لَمْ يُعَدَّ عِلْمُهُ عِلْمًا "

Ubayd Allah bin Abdul Majeed told us, Sawada bin Hayyan told us, he said: I heard Muawiyah bin Qurra Abu Iyas, saying: It was said: “Whoever does not write down his knowledge, his knowledge is not considered knowledge.”