The breast or heart is the seat of wisdom, and the shoulder of strength for action, and these two may denote that wisdom and virtue or power which was in Christ our High Priest, 1 Corinthians 1:24, and which ought to be in every priest.
Related Commentaries of Leviticus 7:34
Leviticus 7:34
34 For the wave breast and the heave shoulder have I taken of the children of Israel from off the sacrifices of their peace offerings, and have given them unto Aaron the priest and unto his sons by a statute for ever from among the children of Israel.