"Every grain offering you bring to the LORD must be made without yeast, for you are not to burn any yeast or honey in a food offering presented to the LORD." (Leviticus 2:11)
The grain offering, minchah, is an offering of flour and oil and frankincense, baked or fried or prepared on a griddle, always without yeast, always with salt. A portion is burned on the altar as a food offering, a pleasing aroma to the LORD; the rest belongs to Aaron and his sons. The prohibition of yeast in the grain offering connects to the unleavened bread of the Passover: yeast is a symbol of corruption spreading through what it enters. The requirement of salt, by contrast, is the covenant of salt - salt preserves and purifies and seasons. Every offering is to have salt: do not leave the salt of the covenant of your God out of your grain offerings.
The grain offering is the offering of the work of human hands: what the earth provides and human labour transforms. The Catechism sees in the grain offering the type of the Eucharist, where the fruit of the earth and the work of human hands become the body and blood of Christ (CCC 1350). The connection is explicit in the liturgy of the Mass: bread and wine, the transformed grain and fruit, are offered as signs of what human work can become when it is placed on the altar of God.
Brothers and sisters, the grain offering is the fruit of your labour placed before God. Every Sunday at the offertory, the bread and wine represent not only Christ's body and blood but your week's work, your daily effort, the grain of your life brought to the altar. Bring it intentionally. Let Monday through Saturday be the preparation for Sunday's offering.
Lord God, receive the grain offering of our work, purified of yeast and seasoned with the salt of your covenant. Let the fruit of our labour be acceptable before you, transformed by the altar into something worthy of your presence. Through Christ our Lord. Amen.