Safwan bin 'Amr bin Harm al-Saksaki صفوان بن عمرو بن هرم السكسكي · Chapters on Seeking Permission

"I entered upon the Messenger of Allah (ﷺ) while there was a scribe in front of him, and I heard him saying: 'Put the pen on your ear, for that is more conducive to the scribe remembering.'"