וַיִּרְחַ֥ץ אֶת־הַקֶּ֖רֶב וְאֶת־הַכְּרָעָ֑יִם וַיַּקְטֵ֥ר עַל־הָעֹלָ֖ה הַמִּזְבֵּֽחָה׃
And he washed the inwards and the legs, and made them smoke upon the burnt-offering on the altar.
Read kabbalistic (mystical) interpretation of Leviticus 9:14: and classical mystical sources.