John Gill Commentary Leviticus 24:7

"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." — Leviticus 24:7 (ASV)

And you shall put pure frankincense upon [each] row
Two cups of frankincense, in each of which was an handful of it, and which were set by each row of the cakes, as Jarchi observes: that it may be on the bread for a memorial ;
or "for the bread", instead of it, for a memorial of it; that being to be eaten by the priests, and this to be burned on the altar to the Lord, as follows: [even] an offering made by fire to the Lord ;
not the bread that was after a time taken away, and eaten by the priests, but the frankincense.