Leviticus 24:8-9

8Every Yom Shabbat he is to set it in order before Adonai continually. It is an everlasting covenant on behalf of Bnei-Yisrael.

9It belongs to Aaron and his sons, and they are to eat it in a holy place, for it is most holy to him among the offerings of Adonai by fire, as a perpetual statute.”