Columbia subject headings:
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Harvard subject headings:
ʻUmar ibn al-Khaṭṭāb, Caliph, -644--Views on Islamic law.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Princeton subject headings:
Islam and state.
Islamic law.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.