Title: Kitāb ʻUmdat al-taḥqīq fī bashāʼir Āl al-Ṣiddīq
Description: Defense of the legitimacy of the succession of Abu Bakr and ʻUmar to the caliphate.
Subjects: Caliphate, History
Places: Islamic Empire
People: Abū Bakr Caliph (-634), ʻUmar ibn al-Khaṭṭāb Caliph (-644)