Grain reduced to the form of meal is spoken of in the time of
Abraham (Gen. 18:6). As baking was a daily necessity, grain was
also ground daily at the mills (Jer. 25:10). The flour mingled
with water was kneaded in kneading-troughs, and sometimes leaven
(Ex. 12:34) was added and sometimes omitted (Gen. 19:3). The
dough was then formed into thin cakes nine or ten inches in
diameter and baked in the oven.
Fine flour was offered by the poor as a sin-offering (Lev.
5:11-13), and also in connection with other sacrifices (Num.
Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'flour' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.