Leviticus 3

YHWH provides regulations for the peace or fellowship offering ('shelamim'), using unblemished animals from the herd or flock; the offerer lays hands on it, slaughters it at the tent entrance, priests sprinkle blood on the altar, and specified fat portions are burned as a pleasing aroma to YHWH, while meat is shared.[2][8]

Interlinear Text

and he shall offer from the sacrifice of the peace offerings an offering made by fire to YHWH its fat the entire fat tail complete close to the backbone he shall remove it and the fat that covers the entrails and all the fat that upon the entrails