Ezekiel 46:5

There must be a grain *sacrifice with the *sacrifice by fire. People gave a *sacrifice by fire to show that they gave themselves completely to God. They gave a grain *sacrifice to show that they gave their work and their possessions to God. A person who gives himself to God cannot keep anything for himself (Luke 9:57-62).

The prince could choose how much grain to give with the young sheep. God was giving the prince an opportunity to show his love for God. Someone may give only what he must give. That person shows little love. Compare Luke 7:47.