 A brief account of the campaign is given by Ibn Qutaybah, and confirmed by the Harran Inscription.See Irfan Shahid's "Byzantium and the Arabs in the Sixth Century" for full details.As late as the 7th century, Khaybar was still inhabited by Jews, who pioneered the cultivation of the oasis and made their living growing date palm trees, as well as through commerce and craftsmanship, accumulating considerable wealth.