And Moses took the breast. — That is, the breast-piece, which was afterwards the perquisite of the officiating priest (see Leviticus 7:34), fell in this instance to the share of Moses, in accordance with the directions given in Exodus 29:26, to be his sacrificial meal since he was divinely appointed to perform the priestly service.
Related Commentaries of Leviticus 8:29
Leviticus 8:29
29 And Moses took the breast, and waved it for a wave offering before the LORD: for of the ram of consecration it was Moses' part; as the LORD commanded Moses.