William Muir,
The Caliphate: Its Rise, Decline and Fall…
“ The tidings reaching Medina just after Mohammad's death, Abu Bekr appointed Feiruz to be his lieutenant. The Arab blood of Keis ibn Mekshuh rebelled against serving under a Persian, and he plotted to expel the whole body of foreign immigrants. To effect this, he called in the aid of 'Amr ibn Ma'dikerib, a famous poet and influential chief who, having like others cast off the Faith, ravaged the country with remnants of the false prophet's army. Daduweihi was treacherously slain by this 'Amr at a feast, but Feiruz escaped, and after much hardship secured his retreat with a friendly tribe. ”
