And the priest
kohen (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.
shall burn
qatar (kaw-tar')
to smoke, i.e. turn into fragrance by fire (especially as an act of worship) -- burn (incense, sacrifice) (upon), (altar for) incense, kindle, offer (incense, a sacrifice).
the fat
cheleb (kheh'-leb)
from an unused root meaning to be fat; fat, whether literally or figuratively; hence, the richest or choice part -- best, fat(-ness), finest, grease, marrow.
upon the altar
mizbeach (miz-bay'-akh)
an altar -- altar.
but the breast
chazeh (khaw-zeh')
the breast (as most seen in front) -- breast.
shall be Aaron's
'Aharown (a-har-one')
Aharon, the brother of Moses -- Aaron.
and his sons'
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.