Leviticus 2:4 Kabbalah

וְכִ֥י תַקְרִ֛ב קָרְבַּ֥ן מִנְחָ֖ה מַאֲפֵ֣ה תַנּ֑וּר סֹ֣לֶת חַלּ֤וֹת מַצֹּת֙ בְּלוּלֹ֣ת בַּשֶּׁ֔מֶן וּרְקִיקֵ֥י מַצּ֖וֹת מְשֻׁחִ֥ים בַּשָּֽׁמֶן׃ (ס)

And when thou bringest a meal-offering baked in the oven, it shall be unleavened cakes of fine flour mingled with oil, or unleavened wafers spread with oil.

Read kabbalistic (mystical) interpretation of Leviticus 2:4: and classical mystical sources.