Unleavened breads. They were usually thin and used in unforeseen situations, such as an unexpected visit, when the fermentation process could not be expected (Gen 18:6). Only loaves could be offered to God. (Lev 2:4-11, Lev 7:12). On the feast of the a., linked to the †¢Passover, only bread was eaten in that form for seven days and the leaven that was in the house was eliminated (Exo 12:14-15). †¢Yeast.
Source: Christian Bible Dictionary
tip, FOOD TYPE LAW
see, LEAVEN, PASSOVER, BREAD, SHOW BREAD (Greek, “sugars,” denoting unleavened, and Hebrew “matz-tzah'”). They were flat cakes of bread, lacking yeast; they are first mentioned in the visit of the three men to Abraham (Gen. 19:3). In the institution of the Passover and the seven-day feast that followed, the presence of leaven in the houses is totally prohibited (Ex. 12:8, 15-21). They were ordered in all the offerings in which the bread entered (Lev. 2:11-12), typifying the absence of all corruption in the sacrifice, figure of Christ, with the exception of the peace offering ordered in Lev. 7:13, of thanksgiving, where the imperfect person of the worshiper is accepted. Throughout the Scriptures, leaven symbolizes iniquity; This is why, following the type of the feast of the unleavened, we are exhorted to celebrate the feast not with leaven of malice and wickedness, but with unleavened bread of sincerity and truth (1 Cor. 5:8). (See YEAST, PASSOVER, BREAD, SHOWBREAD)
Source: New Illustrated Bible Dictionary