Leviticus 24:5-9

And thou shalt take fine flour, and bake twelve cakes thereof: two tenth parts of an ephah shall be in one cake. And thou shalt set them in two rows, six on a row, upon the pure table before Jehovah. And thou shalt put pure frankincense upon each row, that it may be to the bread for a memorial, even an offering made by fire unto Jehovah. Every sabbath day he shall set it in order before Jehovah continually; it is on the behalf of the children of Israel, an everlasting covenant. And it shall be for Aaron and his sons; and they shall eat it in a holy place: for it is most holy unto him of the offerings of Jehovah made by fire by a perpetual statute.