וְאֵ֥ת כָּל־חֶלְבּ֖וֹ יַקְרִ֣יב מִמֶּ֑נּוּ אֵ֚ת הָֽאַלְיָ֔ה וְאֶת־הַחֵ֖לֶב הַֽמְכַסֶּ֥ה אֶת־הַקֶּֽרֶב׃
And he shall offer of it all the fat thereof: the fat tail, and the fat that covereth the inwards,
Read kabbalistic (mystical) interpretation of Leviticus 7:3: and classical mystical sources.