“And thou shalt put pure frankincense upon each row, that it may be on the bread for a memorial, even an offering made by fire unto the LORD.”
King James Version (KJV)
24:7 Pure frankincense - Unmixed and uncorrupted, or of the best sort, to be burnt before the Lord. On the bread - And this was done every time that the bread was changed. For a memorial - For that part which properly belonged to God, whereas the rest belonged to the priests.