Columbia subject headings:
Hadith--Texts--Early works to 1800.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Harvard subject headings:
Hadith--Texts--Early works to 1800
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Princeton subject headings:
Caliphs--Biography.
Hadith.
Islamic Empire--Kings and rulers--Biography.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.