It is reported that a man once wrote to Ibn ʿUmar – Allāh be pleased with them:

Please write down all knowledge for me. Ibn ʿUmar replied: Knowledge is vast, but if you can meet Allāh having kept your back light of the burden of people’s blood, your stomach void of people’s wealth and having kept your tongue from [disparaging] their honour, then do so.

Al-Dhahabī, Siyar ʾAʿlām Al-Nubalāʾ 3:222