Write down your knowledge
It has been related that the Messenger of God (may God bless him and grant him and his family peace) said:
“If a believer after death leaves even one paper which has religious knowledge, then that paper will become a curtain between him and Hell, and for each letter that is written on the paper, Allah (highly glorified and exalted) will give the writer one city which will be seven times broader than a city in this world.”
— Bihar al-Anwar, Vol 2, pg. 144.

