Columbia subject headings:
Muḥammad, Prophet, -632--Friends and associates.
Ḥudhayfah ibn al-Yamān.
Harvard subject headings:
Muḥammad, Prophet, -632--Companions.
Muḥammad, Prophet, -632--Friends and associates.
Ḥudhayfah ibn al-Yamān, -656 or 657
Princeton subject headings:
Ḥudhayfah ibn al-Yamān, -656 or 657.
Muḥammad, Prophet, -632--Friends and associates.