Leviticus 24:5-9

5 "You shall take fine flour, and bake twelve cakes of it: two tenth parts of an ephah shall be in one cake.  6 You shall set them in two rows, six on a row, on the pure gold table before Yahweh.  7 You shall put pure frankincense on each row, that it may be to the bread for a memorial, even an offering made by fire to Yahweh.  8 Every Sabbath day he shall set it in order before Yahweh continually. It is on the behalf of the children of Israel an everlasting covenant.  9 It shall be for Aaron and his sons; and they shall eat it in a holy place: for it is most holy to him of the offerings of Yahweh made by fire by a perpetual statute."

Exodus 25:30

30 You shall set bread of the presence on the table before me always.