“The fat that covereth the inwards” refers to the caul or transparent membrane which has upon it a network of fatty tissue: “the fat upon the inwards” refers to the small lumps of suet found upon the intestines of healthy animals.
Related Commentaries of Leviticus 3:3
Leviticus 3:3
3 And he shall offer of the sacrifice of the peace offering an offering made by fire unto the LORD; the fata that covereth the inwards, and all the fat that is upon the inwards,