entity_id,period_id,confidence,rationale,source_id,review_status
ENT_ISL_ABU_BAKR,PER_ISL_EARLY,high,"Abu Bakr al-Siddiq, the Prophet's closest companion and father-in-law, who became the first Rightly-Guided Caliph (632-634 CE).",SRC_SAHIH_BUKHARI,reviewed