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"Preserve Knowledge by writing it down" So all that has been learned from knowledge, it should be recorded so that it does not get lost. There were Scholars in the past who used to write and copy whole books by hand, over and over again until they memorized it. And from that, is what adh-Dhahabee has reported in his book "Tadkiratul-Huffaadh" He [adh-Dhahabee] mentions that ibn al-Khaadiba ad-Daqaaq wrote/copied all of Saheeh Muslim seven times. And he mentions ibn Marzooq al-Harawee, he wrote/copied the collection of at-Tirmidhee six times [until he memorized it]. And he mentions Abeel-Fadl al-Maqdisee known as ibn Qaysaraanee, he [ibn Qaysaraanee] wrote/copied the Saheehayn [Saheeh al-Bukhaaree and Saheel al-Muslim] and the Sunan of Abu Dawood seven times. And the Sunan of ibn Maajah ten times. And he mentions ibnul-Jawzee and that he wrote a thousand volumes by hand. And he mentions that Shaykhul-Islaam ibn Taymiyyah copied Sunan Abee Dawood six times. And from them were those who would write Ahadeeth on small pieces of paper, and put them in their pockets, and they would look at them from time to time, up until they memorized the hadeeth they had written down on the little piece of paper. There is nothing more beautiful today than to see some of the students of knowledge who carry small pocket notebooks, they record in it benefits, until they memorize them.