Exodus 29:27

And thou shalt sanctify the breast of the wave offering, and the shoulder of the heave offering, which is waved, and which is heaved up, of the ram of the consecration, [even] of [that] which [is] for Aaron, and of [that] which is for his sons:

Ver. 27. The breast of the wave offering, and the shoulder.] To teach the priests to serve the Lord with all their heart, and with all their strength.