https://masjidfurqan.co.uk/2015/12/05/a-brief-and-tremendous-admonition-from-khaalid-ibn-safwaan-that-brought-tears-to-umar-ibn-abdul-azeezs-eyes/
A Brief and Tremendous Admonition from Khaalid Ibn Safwaan That Brought Tears to The Eyes of Umar Ibn Abdul-Azeez