Unleavened bread. — Unleavened bread seems to have been required as purer than leavened, since fermentation was viewed as a species of corruption.
Cakes... tempered with oil. — Rather, cakes that have had oil poured over them. A tolerably thick cake is intended.
Wafers. — These were cakes, or biscuits, extremely thin and unsubstantial, as is implied by the etymology of the term used. Oil is commonly eaten with cakes of both kinds by the Orientals.