How were the long supplications, sermons and Hadith in our tradition actually recorded? Were they written down immediately or just heard and remembered?
Ahlul Bayt (AS) recorded and ordered their followers to record the knowledge. All supplications and sermons and Hadiths were written.
Ameerul Momineen was writing the knowledge from the Prophet in a book called Al-Jami’ah الجامعة.
All our Infallible Imams used to write and order their followers to write.
Wassalam.