Wave Offering

A wave offering was part of ancient Jewish worship. When someone brought food as a gift to God (called a peace offering), the priest would lift up the first portion and move it back and forth in front of the altar. This action showed that the food was being presented to God. The priest would then eat this portion of the food as God's representative

From Tyndale Bible Dictionary, adapted by Mission Mutual. CC BY-SA 4.0.