Leviticus 3:4 (BSB)

both kidneys with the fat on them near the loins, and the lobe of the liver, which he is to remove with the kidneys.

From Leviticus 3. Also in the ESV.

Commentary on Leviticus 3:4

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Leviticus 3:1-5: The burnt-offerings had regard to God as in himself the best of beings, most perfect and excellent; they were purely expressive of adoration, and therefore were wholly burnt. But the peace-offerings had regard to God as a benefactor to his creatures, and the giver of all good things to us; and therefore these were divided between the altar, the priest, and the owner. Peace signifies, 1. Reconciliation, concord, and communion.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Leviticus 3:4: And the two kidneys, and the fat that is on them, which is by the flanks,.... Meaning either the two kidneys which were next the flanks, or the fat upon them, which was next to them; these, and the burning of them, may signify the burning zeal and flaming love and affections of Christ for his people, which instructed him, and put him upon offering...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Leviticus 3:4: the two kidneys . . . of the flock . . . the whole rump--There is, in Eastern countries, a species of sheep the tails of which are not less than four feet and a half in length. These tails are of a substance between fat and marrow. A sheep of this kind weighs sixty or seventy English pounds weight, of which the tail usually weighs fifteen pounds and upwards.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Leviticus 3:3-4: Lev 3:3-4 The person presenting the sacrifice was to offer as a firing for Jehovah, first, “the fat which covered the entrails” (Lev 1:9), i.e., the large net which stretches from the stomach over the bowels and completely envelopes the latter, and which is only met with in the case of men and the mammalia generally, and in the ruminant animals abounds with fat; secondly...