Leviticus 24:7

ונתת על המערכת AND THOU SHALT PUT UPON THE ROW — i. e. upon each of the two rows [PURE FRANKINCENSE]; there were two bowls for this frankincense, each filled with a handful of it. והיתה THAT IT — this frankincense — MAY BE ללחם לאזכרה ON THE BREAD FOR A MEMORIAL — because of the bread itself nothing was offered to the Lord, but the frankincense was burnt when the former was removed from the golden table every Sabbath. It (the frankincense) thus served as a memorial for the bread, because through it, it (the bread) was recalled to memory Above (the bread itself was not offered) just as the “handful” of flour and of oil (Leviticus 2:2) was “the memorial portion” of the meal offering being the only part offered, while the remainder was eaten by the priests just as this bread was.

וְנָתַתָּ֥ עַל־הַֽמַּעֲרֶ֖כֶת לְבֹנָ֣ה זַכָּ֑ה וְהָיְתָ֤ה לַלֶּ֙חֶם֙ לְאַזְכָּרָ֔ה אִשֶּׁ֖ה לַֽיהֹוָֽה׃

And thou shalt put pure frankincense upon each row, that it may be on the bread for a memorial, an offering made by fire to the Lord.