וְהִקְטִ֨יר אֹתָ֤ם הַכֹּהֵן֙ הַמִּזְבֵּ֔חָה אִשֶּׁ֖ה לַיהוָ֑ה אָשָׁ֖ם הֽוּא׃
And the priest shall make them smoke upon the altar for an offering made by fire unto the LORD; it is a guilt-offering.
Read kabbalistic (mystical) interpretation of Leviticus 7:5: and classical mystical sources.