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. 15:3-12; 28:7-29).