Leviticus 9:21

And the breasts and the right shoulder
The breasts of the bullock and the ram, and the right shoulders of them both:

Aaron waved for a wave offering before the Lord;
which was given to him as his part of the peace offerings, after they had been thus waved before the Lord; whereby an acknowledgment was made that he was Lord of all, and had a right to all they had; in token of which these parts were given to his priests towards their maintenance:

as Moses commanded;
see ( Exodus 29:27 Exodus 29:28 ) ( Leviticus 7:34-36 ) .