レビ記 3:9

חלבו means: the choicest part in it; and what is this? The whole fat-tail. לעמת הָעֶצָה — i. e. above the kidneys which give counsel (עֵצָה) (cf. Rashi on Exodus 29:22 and Note thereon).

וְהִקְרִ֨יב מִזֶּ֣בַח הַשְּׁלָמִים֮ אִשֶּׁ֣ה לַיהֹוָה֒ חֶלְבּוֹ֙ הָאַלְיָ֣ה תְמִימָ֔ה לְעֻמַּ֥ת הֶעָצֶ֖ה יְסִירֶ֑נָּה וְאֶת־הַחֵ֙לֶב֙ הַֽמְכַסֶּ֣ה אֶת־הַקֶּ֔רֶב וְאֵת֙ כׇּל־הַחֵ֔לֶב אֲשֶׁ֖ר עַל־הַקֶּֽרֶב׃

And he shall offer of the sacrifice of the peace offering an offering made by fire to the Lord; its fat, and the whole fat tail, it shall he take off hard by the backbone; and the fat that covers the inwards, and all the fat that is upon the inwards,