Leviticus 24:5-7

5“Then you shall take fine flour and bake twelve cakes (bread of the Presence, showbread) with it; two-tenths of an ephah shall be in each cake (loaf).

6You shall set the bread of the Presence (showbread) in two rows, six in a row, on the pure gold table before the Lord.

7You shall put pure frankincense [in two censers, one] beside each row, so that it may be with the bread as a memorial portion, an offering by fire to the Lord.