Leviticus 24:5-9

“Take fine flour and bake it into twelve loaves;  each loaf is to be made with four quarts.  Arrange them in two rows, six to a row, on the pure gold table  before the LORD. Place pure frankincense  near each row, so that it may serve as a memorial portion  for the bread and a food offering  to the LORD. The bread is to be set out before the LORD every Sabbath day as a permanent covenant  obligation on the part of the Israelites. It belongs to Aaron and his sons, who are to eat it in a holy place, for it is the holiest portion for him from the food offerings to the LORD; this is a permanent rule.”