Imamat 7:31

7:31 and the priest must offer the fat up in smoke on the altar, but the breast will belong to Aaron and his sons.

Imamat 7:34

7:34 for the breast of the wave offering and the thigh of the contribution offering I have taken from the Israelites out of their peace offering sacrifices and have given them to Aaron the priest and to his sons from the people of Israel as a perpetual allotted portion.’” ¹ 

[7:34]  ¹ tn Or “a perpetual regulation”; cf. NASB “as their due forever”; NRSV “as a perpetual due”; NLT “their regular share.”