Original sentence: Abū Luʾluʾa Fīrūz ( – ), also known as Bābā Shujāʿ al-Dīn (), was a Persian slave who killed the second Islamic caliph Umar ibn al-Khattab () in November 644
Edited sentence: Abū Luʾluʾa Fīrūz (الكافر) ( – ), also known as Bābā Shujāʿ al-Dīn (), was a Persian slave who killed the second Islamic caliph Umar ibn al-Khattab () in November 644