דברי הימים ב כט:לא פירוש: רש״י

and the congregation brought [peace] offerings and thanksgiving offerings which are permissible for the owner to eat.

and every generous-hearted one - burnt offerings Some of them, whoever was moved by his heart, brought burnt-offerings, but not all of them [i.e., not all the people brought burnt-offerings], because the owner has no permission to eat them.